题目内容
v.to form an idea of the cost, size, value, etc. of sth., but without calculating it exactly
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adj. producing many useful results; bringing forth much; productive
v. To speak suddenly and with strong feeling
n. a series of letters, numbers or symbols that represent a rule or law; a particular method of doing or achieving sth.
n. work, especially when it is done to earn money; the state of being employed; the situation in which people have work
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