英国学生科学读本 第94期:一副风箱(1)

Lesson 94 A Pair Of Bellows 第94课 一副风箱 Have you a pair of bellows at home? 你的家里是否有一副风箱呢? If you have, I hope that you will examine them carefully, and try to see how they are made, and to understand their use. 如果有

英国学生科学读本 第94期:一副风箱(2)

for when you shut the bellows, the valve cannot close the air-hole because of your finger, 因为, 当你关闭风箱把手时, 你的手指使得阀门无法关闭空气进出的圆孔, and most of the air then escapes through this hole instead of g

英国学生科学读本 第95期:面粉与面包(1)

Lesson 95 Flour And Bread 第95课 面粉与面包 Let us buy a pound of flour at the baker's. 我们去面包房买上一磅面粉。 The baker will give us the flour in a nice paper bag, and it will only cost about twopence. 他们会将面粉装在精

英国学生科学读本 第95期:面粉与面包(2)

This powder has to be sifted, to separate the husks from the flour. 然后, 人们利用筛子将面粉与外皮分离。 The husks are hard and coarse, and they would not be good food for us, for we could not digest them. 外皮坚硬且粗糙, 我们

英国学生科学读本 第95期:面粉与面包(3)

Of what use is flour? Every child knows that it is made into bread and puddings and pastry. 面粉有什么用处呢? 孩子们都知道, 面粉可以用来制作面包、布丁与糕点。 To make bread, we must mix the flour with some water, to whi

英国学生科学读本 第96期:人体(1)

Lesson 96 The Body 第96课 人体 This Lesson is going to be about our own selvesabout our bodies. 这篇文章讲述的是我们自己人体。 Every one wants to have a nice-looking and healthy body, which will live a long time. 谁都希望自己拥

英国学生科学读本 第96期:人体(2)

In a few years more the milk-teeth begin to go. 几年之后, 乳牙开始掉落。 Another set of teeth, called the permanent teeth, is growing, one under each of the milk-teeth, and pushing out the first set. 另一套牙齿从原来的位置上长出

英国学生科学读本 第91期:牛奶及用途(2)

Soon all the little balls of cream have their skins or coats broken, and then the tiny pieces of milk-fat inside them stick together and make a lump of yellow butter. 很快, 奶油小球的外膜破碎, 里面的乳脂颗粒则会黏在一起成为一

英国学生科学读本 第92期:一盒火柴(1)

Lesson 92 A Box Of Matches 第92课 一盒火柴 We need fire every day, to warm our houses, or to cook our food, or to give us light. 我们每天都需要利用火来给房间加温、烹饪、照明。 Even savage tribes use fire for such purposes

英国学生科学读本 第88期:冷凝(3)

When we change a liquid into vapour, and cool this vapour till it is liquid again, 将水加热成水蒸气, 然后对其进行冷却直至再次液化, we are said to distil the liquid, and the apparatus for doing this is called a still. 这个过程就

英国学生科学读本 第89期:云和雨(1)

Lesson 89 Clouds And Rain 第89课 云和雨 Each of us drinks about three pints of fresh water every day, and we use a great deal of water for washing, for cooking, and for other purposes. 我们每个人每一天都会饮用3品脱左右的淡水, 而

英国学生科学读本 第90期:结实的橡树(1)

Lesson 90 The Sturdy Oak 第90课 结实的橡树 The oak is one of the finest and most useful of all our forest trees. 在所有森林树种之中, 橡树是最为优良、最为有用的一种树木。 Its height sometimes exceeds sixty feet, while

英国学生科学读本 第90期:结实的橡树(2)

If we take the acorn out of its cup and soak it in warm water for a few hours, it will split open, 如果我们把橡子从中取出, 放入温水浸泡, 几个小时之后它就会裂开。 and we shall see that it consists of two thick seed-leaves,

英国学生科学读本 第90期:结实的橡树(3)

and hang it point downwards from a strip of wood placed across the top of a wide-mouthed bottle, or a pickle-glass, or a tumbler, half full of water. 然后尖头朝下悬挂在一片横放在装有半瓶水的宽口瓶、泡菜瓶或平底玻璃杯口

英国学生科学读本 第89期:云和雨(2)

Every day the sun's rays change thousands of tons of liquid water into water-vapour; 每天, 太阳光都能够将数千吨的液态水转化为水蒸气； and this water-vapour mingles with the air, and is carried along by the wind. 随后, 水蒸气

英国学生科学读本 第91期:牛奶及用途(1)

Lesson 91 Milk And Its Uses 第91课 牛奶及用途 Every child likes to drink new milk. 每个孩子都喜欢喝鲜牛奶。 How pleasant it smells and how sweet it tastes! 那香浓的味道, 甜美的滋味是多么诱人！ Do you not want to kn

英国学生科学读本 第80期:我们脚下的土地(2)

The rock called sandstone is made up of a great many grains of sand. The beating of the rain on this rock washes the grains apart, and so the hard sandstone slowly changes into loose sand. 砂岩主要由大量沙粒组成。当雨水打下来的时候

英国学生科学读本 第81期:一张纸(2)

The torn rags are then boiled in water to which lime and soda have been added. This mixture removes all grease, stains, and colouring matters. The clean white rags are next put with water into another machine, which pulls the fibres apart, tears them

英国学生科学读本 第82期:花园中的蜗牛(2)

Snails do not grow in the winter. They do not come out of their shells at all then, even to eat. When they feel the cold weather coming, each snail finds some quiet place, where it makes a smooth hole in the earth to live in. Then it draws its body i

英国学生科学读本 第79期:扎人的刺猬(2)

With these claws the hedgehog can burrow in the earth under the roots of trees, or in old walls; and in such places he often makes his home. 凭借这些锋利的工具, 刺猬能够在树根或老墙之下打洞穿行, 通常也都在这些地方安家