时间:2018-12-17 作者:英语课 分类:北京仁爱英语八年级下


英语课

Unit 4

[00:02.98]Look into Science!How Can a Paper Have One Side?

[00:10.63]A piece of paper has two sidess.

[00:15.07]See?This piece of paper has a white side and a pink side.

[00:22.44]In this experiment,In this experiment,we make a piece of paper with one side!

[00:29.07]This experiment teaches you what the word "side" means 1

[00:35.60]and what the word "edge 2" means!What do you need?

[00:42.27]a strip 3 of paper markers scissors  tapeA strip of paper is a long,

[00:52.22]thin piece of paper.What do you do?

[00:58.38]1.Hold the two ends of the strip of paper together.

[01:05.23]This makes a circle

[01:08.86]2.Turn one end over and tape the two ends together.

[01:15.99]3. Try to colour one side of the strip.

[01:22.76]What happens?

[01:25.92]4.Follow one edge of the strip all around.

[01:32.87]What do you observe?What is happening?

[01:38.82]You have made a Mobius Strip.

[01:42.97]We usually think that a piece of paper has two sides.

[01:48.85]But a Mobius Strip has only one side.

[01:54.00]It also has only one edge.

[01:58.96]It was named after German mathematician 4 August Mobius (1790-1868).

[02:09.62]What else can you do?Cut the strip in half.What do you think will happen?

[02:16.99]Try it and see!

[02:20.36]You can also have fun by making a Mobius Strip big enough to walk in.

[02:26.91]Here's what to do.

[02:30.15]1.Take a very large strip of paper,three to four metres long.

[02:38.09]2. Paint one side or draw pictures on one side.

[02:44.86]3. Hold the two ends of the paper together.

[02:50.89]4. Turn one end over and tape the ends together.

[02:57.53]5. Start walking on the painted side of the strip

[03:04.06]6. Keep walking all the way around.

[03:09.83](You might need a friend to hold the paper up while you walk.)

[03:16.00]Happy Easter!

[03:19.24]Happy Spring!What does Easter celebrate?Easter is a religious 5 festival.

[03:28.67]Christmas is a religious festival,too.Religious festivals are about God.

[03:36.61]Not everyone in Western countries believes in God,

[03:41.96]but most people still like to have a special timewith their families at Easter.

[03:48.62]When is Easter?

[03:51.99]Easter is celebrated 6 in March or April.It is not on the same date every year.

[04:00.35]How did Easter begin?For thousands of years,people have celebrated spring.

[04:07.90]In spring,life returns to the Earth after winter.

[04:10.78]Life "returns" in springbecause plants start to grow again

[04:20.44]andbaby animals are born.Easter celebrates life,too.

[04:27.28]Some people say God's son,Jesus, returned to life on Easter.

[04:33.95]How do families celebrate Easter today?

[04:38.80]Church.Some families go to church on Easter.Easter bunny.

[04:47.35]The Easter bunny is a rabbit.This rabbit is a little like Santa.

[04:53.88]The Easter bunny brings nice surprises for children.Toys?No,not toys.

[05:02.05]Usually the Easter bunny brings candy made of chocolate.

[05:07.51]Easter eggs.Some people paint eggs at Easter -but not the chocolate kind!

[05:14.96]Eggs,spring and Easter go together.Why?

[05:21.23]Because new life comes out of eggs-- baby birds!Special Easter foods.

[05:30.48]At Easter,many people like to have"hot cross buns 8."A bun 7 is a small bread.

[05:39.02]Hot cross buns have a cross on top.The cross is a symbol of Jesus.

[05:46.59]The cross makes us remember Jesus.

[05:50.96]That's why it's a "symbol.

[05:54.72]"The Force Is All Around You!

[05:58.87]Danny:Oh,no!This is the experiment we're doing for our class!

[06:05.43]Brian:Air pressure is an amazing thing!

[06:09.79]Jenny:Try this experiment over a sink the first time!

[06:14.94]What do you need?

[06:17.97]a glass jar

[06:21.13]a thin piece of cardboard 9

[06:25.18]Jenny:A book is thick.You want the opposite of thick.1. Fill the glass jar to the top with water.

[06:29.33]You want something thin!Danny:This can't be right!What do you do?

[06:40.88]1. Fill the glass jar to the top with water.

[06:47.04]2. Put the piece of cardboard over the jar.

[06:52.97]3. Turn the glass jar over quickly.

[06:59.00]4.Hold your hand on the cardboard for a few seconds.

[07:07.05]5. Take away your hand from under the jar.

[07:14.21]What happens?What is happening?The jar of water is upside 10 down,

[07:20.97]but the water stays in the jar!

[07:25.65]This is because air pressure pushes the cardboard onto the jar.

[07:32.60]There is more air outside the jar than inside,

[07:38.24]so there is more air pressure outside than inside.

[07:45.01]What else can you do?Try the experiment again.

[07:50.96]What happens when you use less water?

[07:56.00]What happens when you use more water?

[08:00.97]What observations 12 can you make?Try it with different kinds and sizes of jars,too.

[08:09.82]Spinning 14 Eggs!

[08:13.06]Jenny:This experiment will teach you three new words:

[08:18.23]"spin 13,""raw" and "inertia 15."Brian:"This is an experiment about physics!

[08:25.68]How can you tell the difference between a raw egg and a cooked egg?

[08:32.76]Well,you can break the eggs open.The raw egg is liquid,like water.

[08:40.62]The cooked egg is solid 16.Is there a way to tell without breaking the eggs?

[08:48.38]Yes!Try this!What do you need?

[08:54.44]two plates two eggs(one raw,one cooked)a pencil a piece of paperWhat do you do?

[09:07.40]1.Spin an eggon each of the plate.What do you observe?

[09:14.55]2.One egg stops first.Which egg?Write down your observation 11.

[09:23.02]3.Spin both eggs again,

[09:28.19]then quickly stop them from spinning and quickly let go of them again.

[09:34.72]What happens?What is happening?

[09:39.97]When something is still,it does not want to move.

[09:45.25]When something is moving,it does not want to stop.This is called inertia.

[09:52.61](The word inertia comes from the Latin 17 word for "lazy.

[09:59.09]"What was happening with the spinning eggs?

[10:03.35]A raw egg is liquid inside.A cooked egg is solid inside.

[10:10.80]A raw egg has more inertia.This slows it down.

[10:17.77]This is why the raw egg stopped spinning before the cooked egg.

[10:24.12]Which egg started to move when you stopped the eggs and let them go again?

[10:30.67]Yes,it was the raw egg.The raw egg has more inertia.

[10:37.44]The liquid in the raw egg was still moving after you stopped the egg.

[10:44.41]This started the egg spinning again.

[10:48.86]Surprise Your Friends!To:Li-Ming@net.cn

[10:57.92]Subject: An Experiment!From:danny@intersaurus.com

[11:07.59]Date:24/04 5:57 PMHi,Li Ming!

[11:16.65]Do you want to surprise your friends?

[11:20.91]Brian,Jenny and I did an experiment in science class today.

[11:27.78]You can do it,too!First,you need to get ready.

[11:34.23]Get a glass full of water and a piece of cardboard.

[11:40.11]Tell a friend to sit down.Cover the glass with the cardboard,

[11:47.68]and turn the glass over.Hold it over your friend's head.

[11:54.34]Tell your friend,"I am going to take my hand off the cardboard.

[12:00.69]Will the cardboard hold the water in the glass?""No,I don't think so,

[12:08.63]"your friend will say."Keep your hand on the cardboard,please!

[12:15.71]"Next,take your hand off.The cardboard will hold the water up!

[12:23.47]Air is heavier than we think!It pushes down on us from above.

[12:30.63]It also pushes up on us from below.

[12:35.88]In the experiment,air pushes up on the cardboard.

[12:41.52]But it can't push down on the water because the water is inside the glass.

[12:48.47]The air holds the water!Science is interesting.

[12:55.03]Don't you think so?Your friend,Danny

[13:01.40]Did you try this experiment?

 



1 means
n.方法,手段,折中点,物质财富
  • That man used artful means to find out secrets.那人使用狡猾的手段获取机密。
  • We must get it done by some means or other.我们总得想办法把它干完。
2 edge
n.边(缘);刃;优势;v.侧着移动,徐徐移动
  • Sight along the edge to see if it's straight.顺着边目测,看看直不直。
  • She lived on the extreme edge of the forest.她住在森林的最边缘。
3 strip
n.长条,条状;连环漫画;n.脱衣舞;vt.脱衣,剥夺;挤干(牛奶);vt.拆卸;去除(烟叶的茎);vi.脱衣,表演脱衣舞;剥落
  • I need one more strip of cloth to finish this decoration.我还要一根布条来完成这个装饰品。
  • We had to strip the old paint from the doors.我们只好把门上的旧漆刮掉。
4 mathematician
n.数学家
  • The man with his back to the camera is a mathematician.背对着照相机的人是位数学家。
  • The mathematician analyzed his figures again.这位数学家再次分析研究了他的这些数字。
5 religious
adj.宗教性的,虔诚的,宗教上的;n.修道士,出家人
  • She is very religious person who goes to church every Sunday.她十分虔诚,每个星期天都上教堂。
  • It is hard for me to reject religious beliefs.要我抛弃自己的宗教信仰是困难的。
6 celebrated
adj.有名的,声誉卓著的
  • He was soon one of the most celebrated young painters in England.不久他就成了英格兰最负盛名的年轻画家之一。
  • The celebrated violinist was mobbed by the audience.观众团团围住了这位著名的小提琴演奏家。
7 bun
n.小而圆的甜面包;(头发扎成的)髻
  • He stole a bun from the shop.他从店里偷了一个圆面包。
  • She wears her hair in a bun.她把头发盘成一个髻。
8 buns
n.圆形的小面包或点心( bun的名词复数 );(女子的)圆发髻
  • The steamed buns fresh from the steamer were nice and warm. 刚出锅的馒头真热火。 来自《现代汉英综合大词典》
  • The steamed buns are cold; let's heat them up. 馒头凉了,縢一縢吧。 来自《现代汉英综合大词典》
9 cardboard
n.硬纸板,卡纸板
  • She brought the shopping home in a cardboard box.她将买的东西放在纸箱里带回家。
  • There is a sheet of stiff cardboard in the drawer.在那个抽屉里有块硬纸板。
10 upside
n.上侧,上段,上部
  • The children hung the picture upside down.小孩把画挂倒了。
  • If you turn the envelope upside down, the key will fall out.你如果把信封倒过来,钥匙就会掉出。
11 observation
n.观察, 观测, 观察资料(或报告)
  • The new breed is under observation.新品种正在观察中。
  • Did you keep him under observation?你对他进行监视了吗?
12 observations
n.观察资料( observation的名词复数 );观察力;注意;言论
  • His observations gave rise to an animated and lively discussion. 他的言论引起了一场气氛热烈而活跃的讨论。 来自《简明英汉词典》
  • He made valuable observations on the prices. 他对物价问题提出了宝贵的意见。 来自《简明英汉词典》
13 spin
v./n.纺,(使)快速旋转;旋转,旋转运动
  • A man cannot spin and weave at the same time.[谚]一心不能二用。
  • We can go for a spin on a bicycle on campus.我们可以骑自行车在校园里兜一圈。
14 spinning
n.纺纱v.使…旋转( spin的现在分词 );纺(线);杜撰;(使)急转身
  • The plane was spinning out of control. 飞机失去控制,不停地旋转。
  • The carriage was spinning along at a good speed. 马车以高速飞跑。 来自《简明英汉词典》
15 inertia
adj.惰性,惯性,懒惰,迟钝
  • We had a feeling of inertia in the afternoon.下午我们感觉很懒。
  • Inertia carried the plane onto the ground.飞机靠惯性着陆。
16 solid
adj.固体的,结实的,可靠的,实心的;n.固体,实心;adv. 一致地
  • Water may change from a liquid to a solid.水可以由液体变为固体。
  • I know that James is a solid type of person.我知道詹姆斯是个可信赖的人。
17 Latin
adj.拉丁的,拉丁语的,拉丁人的;n.拉丁语
  • She learned Latin without a master.她无师自通学会了拉丁语。
  • Please use only Latin characters.请仅使用拉丁文字符。
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