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keep silence 保持安静（沉默）
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keep the ball rolling 使不停顿
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keep the wolf from the door 不至挨饿
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keep time 守时
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keep to 遵守，坚持（做某事）
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keep to oneself 不告诉别人
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keep to the minimum 控制到最低限度
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keep under 控制，压制
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keep under control 控制住
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keep under observation 监督
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keep up 保持，继续下去
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keep up with 跟上，了解（最新情况）
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535 kind (n. )
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kind表示“种类”：
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What kind of tree is this？这是哪种树？
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You’re not suited for the kind of work you’re doing．你不适合做你做的这种工作。
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Which kind do you prefer？你更喜欢哪一种？
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all kinds of, many kinds of等后面的名词用复数形式的较多：
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All kinds of difficulties have to be overcome．有各种困难需要克服。
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Many kinds of apples are grown in our garden．我们花园中种有多种苹果树。
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He tried to communicate with different kinds of people．他设法和不同的人交流。
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在书面语中有时用单数形式：
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I like most kinds of car．我喜欢多数汽车。（在口语中多说“I like most kinds of cars.”)
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There are many different kinds of snake in South America．南美有各式各样的蛇。（在口语中多说different kinds of snakes。）
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用of…kinds作定语也是一个办法：
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