專業英語，翻譯
1 A tensile strain 抗拉應變
2 Through the centroid of the cross sectional area 通過截面的質心
3 The transition from elastic to plastic behavior 從彈性變形到塑性變形的過渡
4 Ductile materials 延展性材料
5 Shear modulus of elasticity 彈性剪切模量
6 antifriction bearings減摩擦（滾動）軸承
7 herringbone gears 雙螺旋齒輪
8 pressure angles 壓力角
9 a constant-diameter cam壹種定徑凸輪
10 a scotch yoke mechanism 壹種止轉軛機構
11 stainless steel 不銹鋼
12 tool and die steels模具鋼，工具鋼
13 temper brittlement熱脆性
14 thermals stress熱應力
15 International Organization for standardization 國際標準化組織
16 planning,grinding and reaming 刨，磨，鉸
17 the compressibility of air 空氣的可壓縮性
18 from hydraulic power to mechnical power從液壓能（水能）到機械能
19 dead load靜載荷
20 surface roughness 表面粗糙度
二. 翻譯成漢語
An axially loaded bar undergoes a change in length,becoming longer when in tension and shorter when in compression. The total change in length is denoted by the Greek letter （delta）and is pictured in fig. l-la for a bar in tension .this elongation is the cumulative result of the stretching of the material throughout the length L of the bar. 壹軸向承載的桿在長度方面會發生改變，在拉伸的時候變長，壓縮的時候變短。 長度的所有變化用拉丁字母（delta）標示，在圖 l-la 中表示的是壹在拉伸的桿。這個伸長是整個桿在長度L內所有材料被拉長的累積結果