题目内容
v. to do or achieve what was hoped for or expected; to do or have what is required or necessary
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n. the gradual development of plants, animals, etc. over many years as they adapt to changes in their environment
adj. the most important or famous; in a position at the front;
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
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