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副词可以修饰名词吗?如果不能,那么twice the speed,twice the increase这样的用法是怎么回

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副词可以修饰名词吗?如果不能,那么twice the speed,twice the increase这样的用法是怎么回事?
RT.
The
new airplane flies at twice the speed of sound.
这架新式飞机以两倍于音速的速度飞行.
副词可以修饰名词吗?如果不能,那么twice the speed,twice the increase这样的用法是怎么回
属于省略比较级,事实上twice还是修饰的是形容词.如:
twice as fast as the speed of sound
twice as many/much as the increase