1. principia: n.原则,基本原则,基本原理
eg. The paper introduces the harm of oxygen corrosion and the principia of deoxygenization,combined the problem of deaerator in running,provided some advice for improvement device.文章介绍了氧腐蚀的危害及除氧原理，结合作者所在单位除氧器在十几年来运行中暴露出来的问题，对今后设备改进提出了自己的见解。
2. stub n.
a short piece remaining on a trunk or stem where a branch is lost
a small piece
a stub of a pencil
synonymous：nub
a torn part of a ticket returned to the holder as a receipt
synonymous：ticket stub
the part of a check that is retained as a record
synonymous：check stub, counterfoil
the small unused part of something (especially the end of a cigarette that is left after smoking)
synonymous：butt
stub v.
pull up (weeds) by their roots
extinguish by crushing
stub out your cigarette now
clear of weeds by uprooting them
stub a field
strike (one's toe) accidentally against an object
She stubbed her toe in the dark and now it's broken
3. ① (ADJ) 有限的;有尽的 Something that is finite has a definite fixed size or extent.
● ...a finite set of elements...
有限元素集
● Only a finite number of situations can arise...
只有有限的几种情况可能会发生。
② (ADJ) (从句)限定的，定式的 A finite clause is a clause based on a verb group which indicates tense, such as 'went', 'is waiting', or 'will be found', rather than on an infinitive or a participle.
4. ether
英 [ˈi:θə(r)] 美 [ˈiθɚ]
n. <化>醚; the ether 苍穹; 苍天; 太空;
5. cesium
英 ['si:zɪəm] 美 ['sizɪrm]
n. 铯
6. platinum
英 [ˈplætɪnəm] 美 [ˈplætnəm]
n. [化学] 铂，白金; 唱片集达100万张的销售量; 银灰色;
adj. 唱片集已售出100万张的;
7. coordinate
|kəʊˈɔ:dɪnət; 美 koʊˈɔ:rd-|
[可数名词] either of two numbers or letters used to fix the position of a point on a map or graph 坐标
the x, y coordinates of any point on a line
一条线上任意一点的x、y 坐标
coordinates [复数] (used in shops/stores etc. 商店等用) pieces of clothing that can be worn together because, for example, the colours look good together （颜色协调的）配套服装，套装
8. diagonal
英 [daɪˈægənl] 美 [daɪˈæɡənəl]
n. [数]对角线; 斜线; 斜列; 斜纹布;
adj. 对角线的; 斜线的; 斜的; 斜纹的;
变形 复数: diagonals
9. warped
英 [wɔ:pt] 美 [wɔrpt]
adj. 反常的; 乖戾的; （变）弯曲的; 变形的;
v. 弄弯，变歪( warp的过去式和过去分词 ); 使（行为等）不合情理，使乖戾，;
10. geodesic
英 [ˌdʒi:əʊˈdesɪk] 美 [ˌdʒioʊˈdesɪk]
adj. 测地学的，测地线的，测量的;
n. 测地线;
11. elongate
英 [ˈi:lɒŋgeɪt] 美 [ɪˈlɔŋgeɪt]
vt. 延长，加长;
变形 过去分词: elongated 过去式: elongated 现在分词: elongating 第三人称单数: elongates
12. deflect
英 [dɪf'lektɪd] 美 [dɪf'lektɪd]
adj. 偏离的;
v. （使）偏斜，（使）偏离，（使）转向( deflect的过去式和过去分词 );
13. curvature
英 [ˈkɜ:vətʃə(r)] 美 [ˈkɜrvətʃə(r)]
n. 弯曲; 弯曲部分; 曲率; 曲度;
