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stern  a.严厉的  n.船尾  be stern with students

futile a.无效的，无用的   a futile life庸碌的一生   a futile remark废话

warfare  n.战争（状态） engage in a warfare  learn warfare through warfare

harsh  a.粗糙的，严苛的  the cloth is harsh  to the touch.这布手感很粗糙  harsh reality

mask one' s ignorance掩盖自己的无知 Ignorance of the law is no excuse.  in ignorance of

toll  n.通行费，死伤人数 impose toll from every passing vessel

plausible  a.似是而非的  Such  a solution is extremely plausible.

erosion  n.腐蚀，削减 contribute to erosion促进风化

blush  v.n.脸红 she blushed with shame\indignation

coupon  n.券  cash coupon现金券 gift coupon礼品券

dock n.码头 vi.进港，扣 stand  in the dock 站在被告喜上  dock one' s pay