题目内容
a. happening or existing before sth. else or before a particular time
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n. a special right or advantage that a particular person or group of people has; the rights and advantages that rich and powerful people in a society have
vt. to arrange for an event, etc. to take place at a later time or date
n. a unit for measuring liquids and some dry goods
v. to go into or through sth. ; to see or show a way into or through sth.
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