题目内容
n. a cover over a container that can be removed or opened by turning it or lifting it
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adj. based on the meter as a standard of measurement;
adj. having more than a basic knowledge of sth. but not yet advanced;
n. a person whose job is repairing machines, especially the engines of vehicles
n. trees that are grown to be used in building or for making things; v. to move in a slow, heavy and awkward way;
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