1.echo?
回響；回聲；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
映現；暗示；啟示；反響the fact of an idea, event, etc. being like another and reminding you of it; sth that reminds you of sth else
共鳴；附和；重復an opinion or attitude that agrees with or repeats one already expressed or thought
修補（程序）；補丁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.回響；回蕩if a soundechoes , it is reflected off a wall, the side of a mountain, etc. so that you can hear it again
發出回聲；產生回響；充滿回聲to send back and repeat a sound; to be full of a sound
~ sth 重復，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）重復…話，模仿to repeat what sb else has just said, especially because you find it surprising
蝙蝠的這種回聲定位常可與雷達相比較。
2.provided 假設?
3.velocity [v?'l?s?ti]（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”這詞，在非技術書籍中可視為同義詞。
4. coordinate
a.同位的；協調的；【語】對等的；【數】坐標的
n.【數】坐標；(圖書,資料編目的)交叉索引；同等者；同位
v.使成同等；使成同位；使配合；調整
closely coordinate緊密配合 axis 坐標軸
olicy Proposals on the Coordinate Development of Urbanization and Industrialization
城鎮化與工業化協調發展的若干政策建議
Sometimes a bit of detective work is needed to pinpoint the exact coordinates.
有時候會有一點偵查工作需要找到確切的坐標。
5 specify ?詳細說明 具體指定
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）認可the state of being legally or officially acceptable符合邏輯；正當；正確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Therefore , once it had been accepted unconditionally within the term of validity it cannot be withdrawn.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，一旦在有效期內被無條件地接受就不可以撤回。
7.overlap 重疊
patch 小塊small area
色斑；斑點；（與周圍不同的）小塊，小片a small area of sth, especially one which is different from the area around it
小片材料piece of material
補丁；補塊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）標記，標識a piece of material that you sew onto clothes as part of a uniform
戒煙貼片a piece of material that people can wear on their skin to help them to stop smoking
地塊piece/area of land
小塊土地；（尤指）菜地，果園a small piece of land, especially one used for growing vegetables or fruit
工作地；熟悉的地區；家鄉an area that sb works in, knows well or comes from
艱難時刻difficult time
一段（艱難）歲月；一段（痛苦）日子a period of time of the type mentioned, usually a difficult or unhappy one
計算機技術in computing
8.diagonal ?synonym：a. slanting,oblique,sloping ?crossways ,croswise?
斜線的；對角線的at an angle; joining two opposite sides of sth at an angle
對角線；斜線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 發出，射出，散發（光、熱、聲音、氣等）to send out sth such as light, heat, sound, gas, etc.
10.redius 半徑
My landlord was the exception because he owned the only bike in a 500-mile radius.
我的房東是個例外，因為他擁有方圓500英里內唯一一輛自行車。
11. snapshot 快照 簡要說明 簡介?
snap 斷開break
（使咔嚓）斷裂，繃斷to break sth suddenly with a sharp noise; to be broken in this way
打開；關上；進入適當位置open/close/move into position
（使啪地）打開，關上，移到某位置to move, or to move sth, into a particular position quickly, especially with a sudden sharp noise
不耐煩地說speak impatiently
厲聲說；怒氣沖沖地說；不耐煩地說to speak or say sth in an impatient, usually angry, voice
動物of animal~ (at sb/sth)咬 迅速猛烈地咬 to try to bite sb/sth
拍照take photograph
拍照；攝影to take a photograph
失去控制lose control
突然失去自制力；一下子無法自持to suddenly be unable to control your feelings any longer because the situation has become too difficult
12.ripple 波紋 ?細浪 漣漪
cone 圓錐體,圓錐形物 , ?路障 （冰淇淋的錐形蛋卷筒）使成錐形,把…卷于錐狀體上,
identical 完全相同的
13 consistent?
一致的；始終如一的always behaving in the same way, or having the same opinions, standards, etc.
連續的；持續的happening in the same way and continuing for a period of time
~ with sth與…一致的；相符的；符合的；不矛盾的in agreement with sth; not contradicting sth
相互連貫的having different parts that all agree with each other
14distribution ?分配 分布?
geodesic 測地線（曲面上兩點間距離最短的線），測地學的
two-dimensional ?二維的 nevertheless 然而不過
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 ?拉長 延長 使伸長
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 ? 輪轉 ?旋轉 ?使輪流 ?輪換?
18.deviation ~ (from sth)背離；偏離；違背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
