aboard: 在船(或飞机,车)上。如:I never went aboard a ship.
broad: 为形容词,宽广的。如:He has very broad shoulders.
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.
这组词都有“杯,杯子”的意思,其区别是:
mug: 通常指周边垂直,不用茶托的有柄大瓷杯或大金属杯。
cup: 指有柄,用来饮茶或咖啡等的瓷杯。
glass: 指玻璃制的杯子,用来盛酒和牛奶等东西。