effectiveness vs efficiency

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effectiveness vs efficiency
effectiveness vs efficiency

effectiveness vs efficiency
efficiency效率（规定时间内的成果）
比如一个人,一个机器的效率.
the efficiency of a washing machine in washing clothes in much higher than that of a man.
洗衣机洗衣服的效率比人高多了
effectiveness
先理解effective:管用的,有效的.
有用的方法:effective method
effectiveness就是有效性,管用性.
比如说你吃一种药,不怎么管用.
你可以说：
I doubt the effectiveness of the medicine.
我怀疑这种药的有效性.

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