1. principia: n.原則,基本原則,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.文章介紹了氧腐蝕的危害及除氧原理，結合作者所在單位除氧器在十幾年來運行中暴露出來的問題，對今后設備改進提出了自己的見解。
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;有盡的 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...
只有有限的幾種情況可能會發生。
② (ADJ) (從句)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 [?i:θ?(r)]? 美 [?iθ?]
n.? <化>醚; the ether 蒼穹; 蒼天; 太空;
5. cesium
英 ['si:z??m]? 美 ['siz?rm]
n.? 銫
6. platinum
英 [?pl?t?n?m]? 美 [?pl?tn?m]
n.? [化學] 鉑，白金; 唱片集達100萬張的銷售量; 銀灰色;
adj.? 唱片集已售出100萬張的;
7. coordinate
|k????:d?n?t; 美 ko???:rd-|
[可數名詞] either of two numbers or letters used to fix the position of a point on a map or graph 坐標
the x, y coordinates of any point on a line
一條線上任意一點的x、y 坐標
coordinates [復數] (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 （顏色協調的）配套服裝，套裝
8. diagonal
英 [da???g?nl]? 美 [da???ɡ?n?l]
n.? [數]對角線; 斜線; 斜列; 斜紋布;
adj.? 對角線的; 斜線的; 斜的; 斜紋的;
變形 復數: diagonals
9. warped
英 [w?:pt]? 美 [w?rpt]
adj.? 反常的; 乖戾的; （變）彎曲的; 變形的;
v.? 弄彎，變歪( warp的過去式和過去分詞 ); 使（行為等）不合情理，使乖戾，;
10. geodesic
英 [?d?i:???des?k]? 美 [?d?io??des?k]
adj.? 測地學的，測地線的，測量的;
n.? 測地線;
11. elongate
英 [?i:l??ge?t]? 美 [??l??ge?t]
vt.? 延長，加長;
變形 過去分詞: elongated 過去式: elongated 現在分詞: elongating 第三人稱單數: elongates
12. deflect
英 [d?f'lekt?d]? 美 [d?f'lekt?d]
adj.? 偏離的;
v.? （使）偏斜，（使）偏離，（使）轉向( deflect的過去式和過去分詞 );
13. curvature
英 [?k?:v?t??(r)]? 美 [?k?rv?t??(r)]
n.? 彎曲; 彎曲部分; 曲率; 曲度;
