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高考 CET-4 CET-6 考研 TOEFL BNC: 1879 COCA: 2135
roofroofD.J.:[ru:f]K.K.:[ruf, rʊf]n.1.屋顶; 顶部The roof of the burning house fell in with a crash.着火房子的屋顶哗啦一声塌下来。It is difficult to get them all together under one roof.把他们都聚集到一起是困难的。

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