词典释义：
释义
join or become involved in an enterprise
加入，参加；卷入
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that's where Jack comes in 那就是杰克卷入之处
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I agreed to come in on the project .我同意加入此计划。
have a useful role or function
有用；起作用
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this is where grammar comes in .这就是语法的用处所在。
[with complement]prove to have a specified good quality
证明有某种好处
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the boots also came in handy for kicking policemen .这双靴子踢起警察来倒也挺合用的。
[with complement]finish a race in a specified position
在赛跑中得名次
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the favourite came in first .最受欢迎的选手跑了第一名。
(of money)be earned or received regularly
（钱）定期被挣得（或收到）。
[in imperative]begin speaking or make contact, especially in radio communication
（尤指无线电通讯中）开始讲话（或接通、互通信息）
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come in, London .请讲，伦敦。
(of a tide)rise; flow
（潮水）上涨；泛滥。
