1.echo
回响；回声；回音the reflecting of sound off a wall or inside a confined space so that a noise appears to be repeated; a sound that is reflected back in this way
映现；暗示；启示；反响the fact of an idea, event, etc. being like another and reminding you of it; sth that reminds you of sth else
共鸣；附和；重复an opinion or attitude that agrees with or repeats one already expressed or thought
修补（程序）；补丁a small piece of code(= instructions that a computer can understand) which can be added to a computer program to improve it or to correct a faultv.回响；回荡if a soundechoes , it is reflected off a wall, the side of a mountain, etc. so that you can hear it again
发出回声；产生回响；充满回声to send back and repeat a sound; to be full of a sound
~ sth 重复，附和（想法或看法）to repeat an idea or opinion because you agree with it
This echo-location in bats is often compared with radar.
+ speech.~ sth
（尤因感到意外而）重复…话，模仿to repeat what sb else has just said, especially because you find it surprising
蝙蝠的这种回声定位常可与雷达相比较。
2.provided 假设
3.velocity [və'lɒsəti]（有方向的）速度1.（沿某一方向的）速度the speed of sth in a particular direction高速；快速high speed
The words "velocity" and "speed" are considered as synonyms unless they are used in technical books.
“速率”和“速度”这词，在非技术书籍中可视为同义词。
4. coordinate
a.同位的；协调的；【语】对等的；【数】坐标的
n.【数】坐标；(图书,资料编目的)交叉索引；同等者；同位
v.使成同等；使成同位；使配合；调整
closely coordinate紧密配合 axis 坐标轴
olicy Proposals on the Coordinate Development of Urbanization and Industrialization
城镇化与工业化协调发展的若干政策建议
Sometimes a bit of detective work is needed to pinpoint the exact coordinates.
有时候会有一点侦查工作需要找到确切的坐标。
5 specify 详细说明 具体指定
to state or identify something in detail or explicitly
to state something or make it a condition
to include or state something in a specification
to explain something in an exact and detailed way
6.validity （法律上的）有效，合法性；（正式的）认可the state of being legally or officially acceptable符合逻辑；正当；正确the state of being logical and true
Therefore , once it had been accepted unconditionally within the term of validity it cannot be withdrawn.
因此，一旦在有效期内被无条件地接受就不可以撤回。
7.overlap 重叠
patch 小块small area
色斑；斑点；（与周围不同的）小块，小片a small area of sth, especially one which is different from the area around it
小片材料piece of material
补丁；补块a small piece of material that is used to cover a hole in sth or to make a weak area stronger, or as decoration
眼罩a piece of material that you wear over an eye, usually because the eye is damaged
（制服上的）标记，标识a piece of material that you sew onto clothes as part of a uniform
戒烟贴片a piece of material that people can wear on their skin to help them to stop smoking
地块piece/area of land
小块土地；（尤指）菜地，果园a small piece of land, especially one used for growing vegetables or fruit
工作地；熟悉的地区；家乡an area that sb works in, knows well or comes from
艰难时刻difficult time
一段（艰难）岁月；一段（痛苦）日子a period of time of the type mentioned, usually a difficult or unhappy one
计算机技术in computing
8.diagonal synonym：a. slanting,oblique,sloping crossways ,croswise
斜线的；对角线的at an angle; joining two opposite sides of sth at an angle
对角线；斜线a straight line that joins two opposite sides of sth at an angle; a straight line that is at an angle
9.emit
v.~ sth 发出，射出，散发（光、热、声音、气等）to send out sth such as light, heat, sound, gas, etc.
10.redius 半径
My landlord was the exception because he owned the only bike in a 500-mile radius.
我的房东是个例外，因为他拥有方圆500英里内唯一一辆自行车。
11. snapshot 快照 简要说明 简介
snap 断开break
（使咔嚓）断裂，绷断to break sth suddenly with a sharp noise; to be broken in this way
打开；关上；进入适当位置open/close/move into position
（使啪地）打开，关上，移到某位置to move, or to move sth, into a particular position quickly, especially with a sudden sharp noise
不耐烦地说speak impatiently
厉声说；怒气冲冲地说；不耐烦地说to speak or say sth in an impatient, usually angry, voice
动物of animal~ (at sb/sth)咬 迅速猛烈地咬 to try to bite sb/sth
拍照take photograph
拍照；摄影to take a photograph
失去控制lose control
突然失去自制力；一下子无法自持to suddenly be unable to control your feelings any longer because the situation has become too difficult
12.ripple 波纹 细浪 涟漪
cone 圆锥体,圆锥形物 , 路障 （冰淇淋的锥形蛋卷筒）使成锥形,把…卷于锥状体上,
identical 完全相同的
13 consistent
一致的；始终如一的always behaving in the same way, or having the same opinions, standards, etc.
连续的；持续的happening in the same way and continuing for a period of time
~ with sth与…一致的；相符的；符合的；不矛盾的in agreement with sth; not contradicting sth
相互连贯的having different parts that all agree with each other
14distribution 分配 分布
geodesic 测地线（曲面上两点间距离最短的线），测地学的
two-dimensional 二维的 nevertheless 然而不过
15 The mass of the sun curves space-time in such a way that although the earth follows a straight path in four-dimensional space-time, it appears to us to move along a circular orbit in three-dimensional space.
16.elongate 拉长 延长 使伸长
17. rotate to move in a circle around a fixed central point, or to move sth. in this way
if people or things rotate, or if you rotate them, they replace one another in a particular order 轮转 旋转 使轮流 轮换
18.deviation ~ (from sth)背离；偏离；违背the act of moving away from what is normal or acceptable; a difference from what is expected or acceptable ~ (from sth)
偏差the amount by which a single measurement is different from the average
