1.momentum ；quality of motion 动量
inertance inertia 惯性 惰性
2.speed速率 velocity速度 （方向）rate 工资每小时20元也叫rate 某个量在某段时间里的变化 比率
3 let go of a ball
drop 垂直高度的降落
4.成正比 in proportional to 成反比 inversely proportional to
variation 变量 quilt 被子
5.preferred state of rest, 缺省状态 ，顺其自然的状态
take place, happen 发生
this lack of absolute position ，or absolute space 没有绝对的位置或者是没有绝对的的空间
6.He observed that the times at which the moons of Jupiter appeared to pass behind Jupiter were not evenly spaced 均匀分布的
7.无限的infinite 极大的 有限的 finite
8.propagation 扩张 扩展 传播
right angle 直角
9.body 物体 像身体一样 有质量有形状 object 物体 更强调对象
10 intrinsic 内在的 extrinsic 外在的
by any measure by any means 无论怎样
fit in 联系起来
11 狭义相对论 时间的距离就是空间的距离 空间的距离就是时间的距离
in term of
validity 合法性 有效期
coordinate，frame，frame of reference ,3-dimension
we are on good terms 我们关系不错
plane 平面
飞机a flying vehicle with wings and one or more engines
平面any flat or level surface, or an imaginary flat surface through or joining material objects
（思想、存在或发展的）水平，程度，阶段，境界a level of thought, existence or development
木工刨；刨子a tool with a blade set in a flat surface, used for making the surface of wood smooth by shaving very thin layers off it
the plane of the orbits of the planets 行星运行轨道的那个平面
specify 具体说明；明确规定；详述；详列to state sth, especially by giving an exact measurement, time, exact instructions, etc.
define 解释（词语的含义）；给…下定义to say or explain what the meaning of a word or phrase is
阐明；明确；界定to describe or show sth accurately
~ sth 画出…的线条；描出…的外形；确定…的界线；界定to show clearly a line, shape or edge
arbitriry 没有理由的 随机的 就这个了 专断的
difference 任何差别都可以 distinction 更有性质上的区别
~ (between A and B)差别；区别；对比a clear difference or contrast especially between people or things that are similar or related
优秀；杰出；卓越the quality of being excellent or important
特质；特点；不同凡响the quality of being sth that is special
~ (between A and B)区分；分清；辨别the separation of people or things into different groups
（尤指给学生的）优等评分，荣誉，奖赏a special mark/grade or award that is given to sb, especially a student, for excellent work
He seemed to think it a distinction.
他觉得这是一种殊勋。
diagonal 对角线的 写下你的 diagram 示意图 flowchart 流程图 flowdiagram 流程图
instantaneous response 瞬时的反应
