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81.a path of travel旅行路线 82.point at / to指向 83.by sea = by ship乘船 , by the sea = on the sea 在海边, at sea在海上 84.set ones mind to do sth.一心想做某事 85.multiplyby乘以 86.See you!再见 You see.你知道,你明白,你瞧 , Let me see.让我想想, see sb. off给某人送行 , see a / the doctor看病, see sb . do / doing sth.看见某人做某事 87.someothers一些(人,物)其他(人,物) oneanother一个..另一个(三者或以上 ) onethe other一个另一个(总数二个) 88.be worn out穿旧，磨坏 , check out核实，检查 , write out写出 , take sth. out of从拿出/取出某物 89.in this way用这种方法 , in a few years time几年以后 , in space在太空 , in and out of class在课内课外 , in the last fifteen minutes在最后十五分钟里 , in the second half 在下半场 , later in ones life在某人后半身 , in the air在空中 , in the open air在户外 90.give sb. an injection给某人打针 , get an injection打针 | 
