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preempt的现在进行时为：preempting...
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preempt的一般过去时为：preempted...
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preempt的音标：preempt的英式发音音标为：[prɪ'empt]preempt的美式发音音标为：[pri'ɛmpt]...
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preempt的第三人称单数（三单）为：preempts...
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vt.先占，取代，先取，先发制人...
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The Clean Water Act expressly provides that it does not preempt more stringent state law.《洁净水法案》明确规定,该法并不先占更为严格的州法律.They do not preempt the land surface that is useful for other purposes.它们不预先占用对其它目的有用的地面.I advised him a...