elect [e-( ex-) = out of 出；lect = to choose 选=>“to choose out of 从…中选出来”→]v. choose by voting选举；推选/ Americans elect a President every four years. 美国人每 4 年选一次总统。
election n. 选举；当选
elective a. 由选举产生的；有选举权的
emit [ e- (ex-) = out 出；mit = to send 送→] v. send out; give off; discharge 发出，散发，放射 The sun emits light and heat. 太阳发出光和热。
emission n. 散发，发射
enormous [e-( ex-) = out of 在…之外；norm = rule 规律；ous a. =being=> “being out of rule 在常规之外的”→]a. very, very large; huge 巨大的；庞大的 / The glutton had an enormous appetite.那个好食之徒食量惊人。
enormously ad. 巨大无比地
erupt [e-( ex-) = out 出；rupt=to burst 爆裂→]v. ①burst out 爆发；喷发 / Lava and ashes erupted from the volcano. 岩浆与火山灰从火山口喷出来。②break out in a rash发疹/ Her skin erupted when she had measles. 她患麻疫时，身上起了疹子。
eruption n. 喷发，爆发；发瘆
eruptive a. 爆发的，喷发的；发疼性的
evaporate [e- (ex-) = out of ; vapor = steam 汽；-ate v. = to make使…“to make steam out of water使蒸汽从水中冒出来”→]v. turn into steam 使蒸发 / Boiling water evaporates rapidly.沸水蒸发得很快。
evaporation n. 蒸发（作用）
下面简单介绍ex-当派生前缀修饰名词的几个例子。
ex-president [ex- = former 前任的；persident n. 总统→]n. former president前总统
ex-soldier [ ex- = former 前的；soldier n. 军人→]n. member of the armed forces 退伍（或退役）军人
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