1. idle adj.懈怠的，没有工作的，懒散的，闲置的 v.混时间，闲荡，挂空挡 eg:Don't be idle all day.You should do something useful. 2. submerge v.浸没，淹没，没入水中 vt.掩盖 eg: The flood will submerge the lowlying areas. 3.conceal vt.隐藏,隐瞒,掩盖 eg:He tried to conceal his mistake from his parents 4.strain n.压力，重负，拉伤，品种，应 vi.用力推(或拉),拉紧;竭力 vt.损伤，拉伤 eg:he's been under a lot of strain. 5.subtract v.减,减去 eg:Subtract 5 from 10 and you get
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