题目内容
a. done without delay; vt. to make sb. decide to do sth. ; to cause sth.to happen
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n. an introduction to a book, especially one that explains the author's aims
vt. to keep a particular quality, feature, etc. ;to make sure that sth. is kept
to make a small hole in sth, or to go through sth. ,with a sharp object
a. of an appropriate size, amount or degree in comparison with sth.
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