最后介绍de-作为动词性前缀与名词结合的例子。
declass [ de- = to make down 使向下；class n. 阶级=>“to make one's class downward 使某人的地位下降”→]vt. degrade or remove from one's class使降低或失去社会地位/ The baron had some working-class relatives, so he was declassed.男爵有一些属于劳工阶层的亲属，因此他的社会地位就降低了。
degrade [ de- = to make down 使向下；grade n. 级别=>“ to make down from one's grade 使某人级别下降”→]vt. reduce to a lower rank 使降低，贬黜 / The sergeant was degraded to private for disobeying orders.那中士因为不服从命令被降为士兵。
degradation a .降级；贬酬；堕落
debark [ de- = to get away from 从…离开；bark n .船 ] v. get off a ship, aircraft, etc.下（船、飞机等），上岸，登陆 / After the passengers debarked in port, the captain debarked his crew.旅客上岸后，船长打发手下人下船。
derail [de- = to cause away from 使…离开；rail n. 铁轨→]vt. cause to run away from the rails 使脱轨 / Several trains were derailed there last year.去年有好几列火车在那里脱轨。
derailment n. 脱轨
deforest [de-=to remove 取走；forest n. 森林→] vt. remove the trees from; clear off forests 砍掉…的树木；开发森林 / The land had to be deforested before the peasants could farm it 农民 要先砍掉那块地上的树木，才能在上面耕种。
dethrone [ de- = to remove from 从…移走；throne n. 王位→] vt. remove from a throne or ruling 废黜；罢免 / The rebels dethroned the weak king.起义者废黜了无能的国王。 dethronement n. 废黜；罢免
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