The new map of the ocean floor shows the locations of twice as many undersea volcanoes as were previously thought to exist.

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曹荣禄 2021-02-19 22:09

擅长：动词用法,句法问题

twice+as many+复数名词+as ：意为是。。。的二倍。as引导比较分句，比较对应项作主语必须省略，故as后直接为谓语形式were thought...。

这里牵涉二方面语法知识，一个是倍数表示法，一个是as从句结构。如果你是初学者，目前只需了解倍数表示法即可。

A is three times as big as B. A 是Ｂ的三倍大。

Ｉhave three time as big a house as you have. 我的房子是你的房子的三倍大。