名词性从句19.Output is now six times---it was before liberatoin.

可以说six times the amount of what it was before liberation,这用的是倍数+ the +名词 (size/length/width/height。。。)of。。。的结构,当然也可以说Output is now six times what it was before liberatoin,此种情况下相当于省略了“名词 (size/length/width/height。。。)of。。。”结构,后面直接跟名词性从句,而本句中what it was before liberatoin 就是一个以wh特殊疑问词引导的名词性从句,指的是之前的产出。类似的句子还有：The production is now double what it was ten years ago。现在的产量是十年前的两倍。多看几个例子,认真体会这样一种用法,顺便找点语感。