preempt的第三人称单数（三单）为：preempts...

preempt的现在进行时为：preempting...

preempt的现在完成时为：preempted...

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]...

preempt的一般过去时为：preempted...

vt.先占，取代，先取，先发制人...

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...