[机] 穿心孔直径

The Moon 月球 We find that the moon is about 239,000 miles (384,551 km) away from the earth, and, to within a few thousand miles, its distance always remains the same. Yet a very little observation

发表于:2018-12-05 / 阅读(162) / 评论(0) 分类 有声英文阅读

If it points the camera forward, at first it sees only black. But as it moves toward the heart of the black hole, it encounters the most bizarre place in the universe. A black hole in massive gravity holds everything down to an unimaginably small poi

发表于:2018-12-07 / 阅读(300) / 评论(0) 分类 访谈录2010

Four times a year, Ghez focuses the telescope on the stars of the very heart of our Milky Way. She is looking for the telltale high speeds that reveal the presence of a black hole. The center of the M

发表于:2018-12-07 / 阅读(420) / 评论(0) 分类 超大质量黑洞

In every galaxy scientists looked at, they found evidence for a supermassive black hole. NGC 3115 NGC 3377 NGC 3379 In M31 and M32 In total there is probably 20-30 or so black holes that have been fou

发表于:2018-12-07 / 阅读(445) / 评论(0) 分类 超大质量黑洞

By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w

发表于:2018-12-07 / 阅读(435) / 评论(0) 分类 超大质量黑洞

Quarter 25分硬币 A quarter is an American or Canadian coin. quarter是指美国或加拿大的一种硬币。 How much is a quarter? 这种硬币值多少钱呢? A quarter is equal to 25 cents. 它等价于25分。 It is worth one fourth of a do

发表于:2018-12-13 / 阅读(130) / 评论(0) 分类 与美国小学生一起学英文第5册

Heres what scientists think happened, oh, about a hundred million years ago. There was this three-star system. The three linked stars were strolling through the galaxy but got too close to the giant black hole at the center. The hole swallowed one of

发表于:2018-12-24 / 阅读(122) / 评论(0) 分类 Scientific American(七)月

A hypervelocity star appears to be the remains of a three-star system, one star of which was digested by the Milky Way's black hole, with the other two being combined and hurled away. Heres what scientists think happened, oh, about a hundred million

发表于:2019-01-02 / 阅读(157) / 评论(0) 分类 60秒科学

Researchers: Many Black Holes in Center of Milky Way Galaxy Astronomers say the center of our galaxy has plenty of strange, super gravity objects. For years, scientists believed that circling the center of galaxies, including our own Milky Way galaxy

发表于:2019-01-03 / 阅读(124) / 评论(0) 分类 2018年VOA慢速英语(四)月

Hi, I'm Carl Azuz. Welcome to this Columbus Day edition of CNN Student News! We'll be talking more about Columbus Day in just a couple minutes. But first, we're reporting on a breakthrough in Chile. And we mean that literally. A hole big enough to re

发表于:2019-01-08 / 阅读(153) / 评论(0) 分类 CNN2010年(十)月

Diameter 直径 A diameter is a straight line inside a circle. 直径是圆内的直线。 Can any straight line in a circle be a diameter? 圆内的任何直线都是直径吗? No, its two ends must meet at two different points on the circle. 不是

发表于:2019-01-10 / 阅读(130) / 评论(0) 分类 与美国小学生一起学英文第9册

In the storeroom 在库房 A:Where can I find a spare hose for the pump? A:我在哪里可以找到一跟备用的机泵软管? B:What size do you need? B:你需要什么型号的? A: 25 mm diameter. A:直径25毫米的。 B:They're at the back o

发表于:2019-01-14 / 阅读(152) / 评论(0) 分类 职业技术英语口语

A: I am looking for a pan. B: No problem. What size would you like? A: A big one would be nice. B: How about this one? It's our biggest16 in diameter. A: Oh, yes. I like that one. But it's too heavy. B: Okay, try this one. It's made of aluminum. A: O

发表于:2019-01-20 / 阅读(190) / 评论(0) 分类 购物英语对话

A: I am looking for a pan. B: No problem. What size would you like? A: A big one would be nice. B: How about this one? It's our biggest16 in diameter. A:I like that one, but it's too heavy. B: Okay, try this one. It's made of aluminum. A: This is muc

发表于:2019-01-21 / 阅读(173) / 评论(0) 分类 购物-Shopping

Each tag is whipping around the center of the galaxy, the particular, the most striking thing you will notice is the motion of SO2.So SO2 goes on an incredible roller-coaster ride. It comes whipping around and then back out. Something with tremendous

发表于:2019-01-22 / 阅读(119) / 评论(0) 分类 自然百科2011年

Galaxies could in a way, be much bigger than they currently are. Something is stopping them growing larger and that something is the black hole at the center. Now this is bizarre because the ration of the size of the black hole to the size of the gal

发表于:2019-01-23 / 阅读(151) / 评论(0) 分类 探索与发现2013年

If there's a black hole at the center of our galaxy, that's gonna force these objects that are really close to the black hole to move much faster than they would move if there were no black holes. So the first thing you wanted to see is there are ver

发表于:2019-01-23 / 阅读(112) / 评论(0) 分类 探索与发现2013年

Tree climbing: Part 2 NB: This is not an accurate word-for-word transcript Dan: Hello and welcome to this weeks 6 Minute English. Im Dan Walker Smith and today, for the second part of our tree climbing programme(节目,计划), Im joined by Kate.

发表于:2019-02-05 / 阅读(172) / 评论(0) 分类 六分钟英语

台湾籍旅美老师今天交给我们的句子是: In fact, a black hole with the diameter of a nickel would be slightly more massive than the Earth. It would have a surface gravity a billion billion times greater than our planet currently does. 事

发表于:2019-03-05 / 阅读(180) / 评论(0) 分类 留美老师带你每日说英文

Did you ever dream of digging a hole so deep it came out the other side of the earth? Let's play that game again, using a little physics. First we have to imagine that our tunnel is lined with super-heat-resistant material so we can pass through laye

发表于:2019-03-06 / 阅读(204) / 评论(0) 分类 英语时差8,16
学英语单词
a-coelous vertebrae
actual purchase price
alkyl benzine
arched beam
Astacinae
Banloc
bioincompatible
bivalent atom
Bothrodendraceae
break clause
bulk volume
c-h
call routing
chain-brake
climb on rail
Companies House
concentric-lay conductor
Crossmichael
cylindroconical ball mill
Cynewulf
decluttered
diffusion theory approximation
direct-axis subtransient time constant
direction error
Dötlingen
false advertising
flight information center
follicular oogenesis
full and bye
galllium halides
gasketed holder
gastroenterologists
get into one's head
glyceryl monostearate
granite slab
green clause credit
holography scanner
humourous
hyped
hypervascularized
Imigran
IMPROP
infinitely-great
infusible compound
irish yarn
isidro
iwce
jrom
lay down the rule that...
listed vehicles
market-towns
Martiago
multinormal distribution
multiple entry volume table
mustenaunce
mutilated check
Neosedyn
nonreaginic
operating valve lever
orwin
overhead side volt-meter
PARAMECOPTERA
Patriot Act
plank-sheers
polyene
polyneuritides
prechondrogenic
preparatory plan
psych pay
put a human face on
radiation dominated gas
radio-tellurium
razoumowskyn (razoumovskyn)
reductionistic model
reel to reel recorder
remote computing system exchange
respiratory spasm
retrospective payment
Rhoma
rotary electrical joint
scalp sb for a jay
scintillating crystal
Scotia Sea
scraping masters
shake-off
shemin
short-trace section
sinnventricular
slit gong
spike bowsprit
spiral lifecycle model
sponge plastic
spring heath
square configuration
stone pine
supinidine
suspended item
target ammunition
trophophases
truch
Uraricoera, R.
wire-mesh steam washer