题目内容
v. to make a serious, angry or worried expression by bringing your eyebrows closer together so that lines appear on your forehead
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n. the state of being in a place or situation where there is no protection from sth. harmful or unpleasant;
v.to become greater in size, number or importance; to make sth. greater in size, number or importance
v.to form an opinion of the amount, value or quality of sth. after thinking about it carefully
n. the form in which a book is published; the total number of copies of a book, newspaper or magazine, etc. published at one time
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