1.在（某范围或空间内的）某一点at a point within an area or a space例：a country in Africa
非洲的一个国家
2.在（某物的形体或范围）中；在…内；在…中within the shape of sth; surrounded by sth例：She was lying in bed.
她躺在床上。
3.进入into sth例：He dipped his brush in the paint.
他把毛刷在涂料里蘸了蘸。
4.构成…的整体（或部分）；包含在…之内forming the whole or part of sth/sb; contained within sth/sb例：There are 31 days in May.
五月份有31天。
5.在（某段时间）内during a period of time例：in 2005
在2005年
6.在（某段时间）之后after a particular length of time例：to return in a few minutes/hours/days/months.
几分钟 / 几小时 / 几天 / 几个月后回来
7.(used in negative sentences or after first , last , etc. 用于否定句或first、last等之后)在（某段时间）内for a particular period of time例：I haven't seen him in years.
我有好些年没见过他了。
8.穿着；戴着wearing sth例：dressed in their best clothes
穿着他们最好的衣服
9.（用以描述具体的环境）used to describe physical surroundings例：We went out in the rain.
我们冒雨出去了。
10.（表示状态或状况）used to show a state or condition例：I'm in love!
我恋爱了！
11.参与；参加involved in sth; taking part in sth例：to act in a play
12.参加演戏（显示工作或职业）used to show sb's job or profession例：He is in the army.
他在军队服役。
13.（显示某物的形式、形状、安排或数量）used to show the form, shape, arrangement or quantity of sth例：a novel in three parts
分为三部的小说
14.（表示使用的语言、材料等）used to show the language, material, etc. used例：Say it in English.
用英语说吧。
15.关于；在…方面concerning sth例：She was not lacking in courage.
她并不缺乏勇气。
16.做…时；…发生时；当…时while doing sth; while sth is happening例：In attempting to save the child from drowning, she nearly lost her own life.
她在抢救落水儿童时，自己差点丧命。
17.（引出具某种品质的人的名字）used to introduce the name of a person who has a particular quality例：We're losing a first-rate editor in Jen.
我们即将失去珍这位一流的编辑。
18.（显示比率或相对数量）used to show a rate or relative amount例：a gradient of one in five
五分之一的坡度
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