at rest 静止
The natural state of a body was to be at rest
Laws of motion 运动定律，即Newton's law of motion
be proportional to与……成比例，正比于
elliptical
ADJ Something that is elliptical has the shape of an ellipse. 椭圆形的
例：...the moon's elliptical orbit.
...月球的椭圆形轨道。
2.ADJ Elliptical references to something are indirect rather than clear. 隐晦的
例：...elliptical references to problems best not aired in public.
...最好不要公开的对问题的隐晦提及。
With respect to 关于
Body A was at rest and body B was moving at constant speed with respect to body A!or that.....
Millionth
ORD The millionth item in a series is the one you count as number one million. 第一百万的
例：Last year the millionth truck rolled off the assembly line.
去年，第100万辆卡车驶下了装配线。
2.FRACTION A millionth of something is one of a million equal parts of it. 百万分之一的
例：The bomb must explode within less than a millionth of a second.
那枚炸弹必须在百万分之一秒内爆炸。
Hitherto 迄今
adv.1.used in negative statement to describe a situation that has existed up to this point or up to the present time
Give the credit for 称赞
Einstein is usually given the credit for the new theory.
Postulate
If you postulate something, you suggest it as the basis for a theory, argument, or calculation, or assume that it is the basis. 假定
A Pulse of light 光脉冲
Velocity
N-VAR Velocity is the speed at which something moves in a particular direction. (沿某一方向运动的) 速度
例：...the velocities at which the stars orbit.
…恒星绕轨道运行的速度。
Cesium clock
【电子学】铯原子钟，铯钟(利用元素铯的原子振动频率量度时间的原子钟)
Platinum
N-UNCOUNT Platinum is a very valuable, silvery-grey metal. It is often used for making jewellery. 铂; 白金
Coordinate
N-COUNT The coordinates of a point on a map or graph are the two sets of numbers or letters that you need in order to find that point. 坐标
例：Can you give me your coordinates?
能给我你的坐标吗？
One can describe the position of a point n space by three numbers,or coordinates
Patch
N-COUNT A patch on a surface is a part of it that is different in appearance from the area around it. (与周围不同的) 块; 片
例：...the bald patch on the top of his head.
…他头顶上那块秃斑。
例：There was a small patch of blue in the grey clouds.
乌云中透着一小块蓝天。
2.N-COUNT A patch of land is a small area of land where a particular plant or crop grows. 小块田地
例：...a patch of land covered in forest.
…一块长着树林的田地。
例：...the little vegetable patch in her backyard.
…在她后院的小块菜地。
3.N-COUNT A patch is a piece of material that you use to cover a hole in something. 补丁
例：...jackets with patches on the elbows.
…肘部打着补丁的夹克。
4.N-COUNT A patch is a small piece of material that you wear to cover an injured eye. (保护受伤眼睛的) 眼罩
例：She went to the hospital and found him lying down with a patch over his eye.
她去医院看见他躺着，眼睛上蒙着眼罩。
5.V-T If you patch something that has a hole in it, you repair it by fastening a patch over the hole. 打补丁
例：He and Walker patched the barn roof.
他和沃克修补了那个谷仓的顶。
例：One of the mechanics took off the damaged tyre, and took it back to the station to be patched.
其中一个机械师取下受损轮胎，把它拿到站里修补。
6.N-COUNT A patch is a piece of computer program code written as a temporary solution for dealing with a computer virus and distributed by the makers of the original program. (对付计算机病毒的) 补丁
例：Older machines will need a software patch to correct the date.
旧的机器需要软件补丁来修正日期。
7.PHRASE If you have or go through a rough patch, you have a lot of problems for a time. 一段艰难时期
例：His marriage was going through a rough patch.
他的婚姻正处于一段艰难时期。
A collection of overlapping patches
Radius
N-SING The radius around a particular point is the distance from it in any direction. 范围
例：Nick has searched for work in a ten-mile radius around his home.
尼克已经在以家为中心10英里的范围内寻找工作。
2.N-COUNT The radius of a circle is the distance from its centre to its outside edge. 半径
例：He indicated a semicircle with a radius of about thirty miles.
他标示出一个半径大约三十英里的半圆。
Stack N&V 一摞，一堆/摞起，堆起
Snapshot
N-COUNT A snapshot is a photograph that is taken quickly and casually. 快照
例：Let me take a snapshot of you guys, so friends back home can see you.
让我给你们大家拍张快照，这样家里的朋友们可以看到你们。
2.N-COUNT If something provides you with a snapshot of a place or situation, it gives you a brief idea of what that place or situation is like. 简况; 大致印象
例：The interviews present a remarkable snapshot of Britain in these dark days of recession.
这些访谈深刻地展现了英国在黑暗的经济大萧条时期的点滴情况。
If one stacks snapshots of the ripples at different times one above the other....
cone 圆锥体，圆锥形
Geodesic
1.ADJ relating to or involving the geometry of curved surfaces 曲面几何学的 (See also geodetic, geodesical)
2.N the shortest line between two points on a curved or plane surface 短程线 (Also called geodesic line)
Elongated orbit 被拉长的轨道
Deviation偏差 偏离
Light deflection 光线偏折
In progress
在进行中；在进展中；正在发生；正在办理；正在执行；还没有完的
The first word war was in progress
时间和空间，是一直以来人类的难题。很难想象，像牛顿、爱因斯坦这样的科学家是如何突破思维的惯性，找到突破口，成功带领我们走入一个无法看见的世界。这个世界一直以来就在吸引着我们，因为对时间，人类有太多欲望。想要回到过去，想要扭转过去，甚至想要预测未来。。。然而相对论告诉我们，即使是超过光速就能回到过去，那也不是我们看见的过去。能改变的从来不是时间，只是我们对时间的概念而已。时间的一维性作为真理，颠扑不破。但是由于这本书，我摆脱了对时间的执念，不再纠结分秒，因为事实上，每个人的时间都是不一样的，哪怕我们的钟表都指向同一个点。
