- hardly a day几乎一天
- area of section截面面积，剖面面积;
- angle of refractionn.折射角;
- angle of external friction外摩擦角;
- all parts of the country全国各地
- aging of population[医] 人口变老;
- a must必须的
- a basket of一篮;
- bring to a haltv.使停止;
- a glass of一杯;
- contract of service劳务契约;
- chains of islands岛群;
- dean of the diplomatic corps外交使团主任
- enter a race参加比赛;
- four of a kind四张相同的牌;
- get a shock大吃一惊;
- length of stroke冲程（长度）;
- make it a rule定为常规;
- make a trip to去一次
- make a reservation订餐;
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