deplete: implies a reduction in number or quantity and the actual or potential harm done by such a reduction: we cannot afford to ~ our natural resources.


drain: implies a gradual withdrawl and ultimate deprivation of what is necessary to a thing's existence and functioning: a series of personal tragedies ~ed him of hope.


exhaust: stresses a complete emptying or using up: a theme that can never be ~ed.


impoverish: suggests a deprivation of something essential to vigorous well-being : without the arts we would lead an ~ existence.        又如the dictator enriched himself but impoverished his people独裁者使自己富有、却使人民变得贫穷; 如poor farming practices impoverished the soil不良的耕种方式使土地变得贫瘠，如impoverished soil贫瘠的土地


bankrupt: suggests impoverishment to the point of imminent collapse: war has ~ed the nation of manpower and resources.


deplete大量减少、耗尽: 数量减少造成损害，drain耗尽: 逐渐减少到最终完全丧失无法生存，exhaust耗尽: 强调完全用尽，impoverish使贫穷贫瘠: 使人贫穷(well-being福祉)、土地贫瘠，bankrupt耗尽: 到频临崩塌的地步


记忆方法: 1) 首字母DDEIB重组为DB数据库和DIE死机<==电源耗尽

         2) 耗尽的意思是丧失生存所必需的mean to deprive of something essential to existence or potency.首字母DDEIB重组为DB数据库和DIE死机<==电源耗尽