instantaneous和instant有什么区别?后缀aneous表示什么?
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通过后缀aneous的来源就可以知道这两个词区别.

1640s (implied in instantaneously),formed in English from M.L.*instantaneus,from instantem (see instant (n.)) on model of spontaneous,simultaneous.

意思是说aneous来自spontaneous和simultaneous.

instantaneous侧重描述事件发生的突然性

instant侧重描述事件发生之快

两个例子对比:

1.他的第一反应是跑

His instantaneous response was to run.这个时候用instant就不如instantaneous合适.

2.他马上就反应过来然后跑了

His instant response was running away.这个时候用instant就比instantaneous合适.

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