1.impulse
~ (to do sth) 冲动；心血来潮；一时的念头a sudden strong wish or need to do sth, without stopping to think about the results
动力；冲力；冲量a force or movement of energy that causes sth else to react
推动力；刺激something that causes sb/sth to do sth or to develop and make progress
2.equivalent
（价值、数量、意义、重要性等）相等的，相同的equal in value, amount, meaning, importance, etc 等效的.
n.相等的东西；等量；对应词a thing, amount, word, etc. that is equivalent to sth else
alternative
可供选择的事物a thing that you can choose to do or have out of two or more possibilities
可供替代的that can be used instead of sth else
非传统的；另类的different from the usual or traditional way in which sth is done
As she was no horsewoman, walking was her only alternative.
她既然不会骑马，唯一的办法便只有步行。
The same is to be able to save technology into a good market an alternative path.
这同样是能够将好技术转化为好市场的另一条路径。
3.slope 斜坡 山坡 斜面
4lead 铅 领导 导线
5.slowed down by air resistance,
perform the experiment 做实验
6.it was always acted on by the same force,set it moving
7. What happens to a body when a force does act on it is given by Newton's second law.
at a rate that is proportional to the force
The same force acting on a body of twice the mass will produce half the acceleration.
cancel each other 互相抵消
gravitational attraction 地球引力 重力
a star is exactly one quarter that of a similar star at half the distance.与距离的平方成反比
9.elliptical 椭圆的，（因太简练说的太少）晦涩难懂的
ellipse 椭圆
eclipse ，in eclipse 失色的 lunar eclipse月食 solar eclipse日食
10.spiral
螺旋形；螺旋式a shape or design, consisting of a continuous curved line that winds around a central point, with each curve further away from the centre
逐渐加速上升（或下降）a continuous harmful increase or decrease in sth, that gradually gets faster and faster 逐渐加速上升，螺旋式上升（或下降）
11.with respect to 相对于
One could equally well say that body A was at rest and body B was moving at constant speed with respect to body A,or that body B was at rest and body A was moving
12.contant
adj.连续发生的；不断的；重复的happening all the time or repeatedly
不变的；固定的；恒定的that does not change
n.常数；常量a number or quantity that does not vary
constant temperature 恒温
13. rotation
旋转；转动the action of an object moving in a circle around a central fixed point
（旋转的）一周，一圈one complete movement in a circle around a fixed point
轮换；交替；换班the act of regularly changing the thing that is being used in a particular situation, or of changing the person who does a particular job
earth‘s rotation 地球自转 and its motion around the sun 公转
14.axis 复数 axes
15. curve 曲线 弯曲 弄弯
16.accord with 与。。一致
Newton was very worried by this lack of absolute position, or absolute space, as it was called, because it did not accord with his idea of an absolute God.绝对上帝
irrational belief 非理性信仰
illusion 错觉 假象 ambiguous 模棱两可的 interval 间歇 休息时间
c= 3*10 8m/s 30万千米每秒
I got stood up.我被放鸽子了，
get sb stand up ,bail on sb.放某人鸽子
sb. is a no-show,某人爽约 Don't blow me up 不要放我鸽子。
17. molecule, atom，proton，neutron，electron，分子，原子，质子，中子，电子，
voltage 电压 resistance 电阻 electric current，电流
18. hitherto adv until now; until the particular time you are talking about迄今；直到某时
19.clerk 职员 文员
20.patent 专利 专利权 专利品 a明摆着的
21.postulate v&n
假定；假设to suggest or accept that sth is true so that it can be used as the basis for a theory, etc.
假定； 假说 a statement that is accepted as true, that forms the basis of a theory, etc.
First, we must postulate that if souls exist, they must have some mass.
第一，我们必须假定灵魂存在，他们必须保有物质。
22.equation 方程 ，equative 等价的 等同的，equality （地位 权利）平等 equalize 使相同
equivalent equal in value, amount, meaning, importance, etc.（价值、数量、意义、重要性等）相等的，相同的.equivalent
（价值、数量、意义、重要性等）相等的，相同的equal in value, amount, meaning, importance, etc 等效的.
n.相等的东西；等量；对应词a thing, amount, word, etc. that is equivalent to sth else
23 intrinsic 固有的 内在的
1.belonging to something as one of the basic and essential features that make it what it is 2.by or in itself, rather than because of its associations or consequences 3.occurring wholly within or belonging wholly to a part of the body such as an organ 4relating to the essential qualities or features of something or someone
24.In other words, the theory of relativity put an end to the idea of absolute time
An equally remarkable consequence of relativity is the way it has revolutionized our ideas of space and time.
25.identical 完全一样的
diagram
图解 示意图
platinum 铂 白金 cesium 铯
time is not completely separate from and independent of space,
