题目内容
n. something that is difficult to understand or to explain;
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adj. lasting for a long time or for all time in the future; existing all the time
n. something that happens or exists; the fact of sth. happening or existing
n. the skill or the process of planning a route for a ship or other vehicle and taking it there
n. a large group of people who play various musical instruments together, led by a conductor
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