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来源：网络资源 2023-03-31 16:37:59
51 be made of由……制成(制成以后还看得见原材料)
52 be not sure表不确定
53 be on a visit to参观
54 be popular with sb受某人欢迎
55 be quiet安静
56 be short for表**的缩写eg:陶is short for陶俊杰
57 be sick in bed生病在床
58 be sorry to do sth be sorry for sb eg : I am sorry for you
59 be sorry to hear that 60 be sorry to trouble sb eg : I am sorry to trouble you
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