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编辑推荐：2015成人英语三级考试复习重点汇总
aboard, abroad, board, broad
aboard在船(或飞机，车)上。
如：I never went aboard a ship.
abroad副词，在国外或海外。
如：He often goes abroad.
board为动词，上(船，飞机，车)。
如：The passengers are boarding the plane now.
broad为形容词，宽广的。
如：He has very broad shoulders.
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