题目内容
adj. able to use your senses and mental powers to understand what is happening
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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
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
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