Giving the worker a cart greatly improved his efficiency,and now he can work twice as fast.
老师,as fast省略了as fast as he can do before.这样理解吗;老师,比较状语从句就要省略吗?
twice as fast为倍数表示法。是二倍,快一倍。
three time faster: 快二倍,是三倍。
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