题目内容
v.to fall down or fall in suddenly, often after breaking apart; n. a sudden failure of sth., such as an institution, a business or a course of action
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adj. worth having or seeking or achieving
v. (of people or animals) to move slowly, quietly and carefully, because you do not want to be seen or heard
n. a high area of rock with a very steep side, often at the edge of the sea or ocean
v.to decide that sb./sth. is not important and not worth thinking or talking about; to put thoughts or feelings out of your mind
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