题目内容
adj. the most important or famous; in a position at the front;
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v. to close or join together the two parts of sth.; to become closed or joined together
v. to make sure that people obey a particular law or rule
n. the quality of doing sth. well with no waste of time or money
n. a device containing paper, sand, chemicals, etc. that a liquid or gas is passed through in order to remove any materials that are not wanted;
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