n times as much as/n times more than

让我们引用 A Comprehensive Grammar of the English Language 的论述, 就可以弄清这个问题。

“可数的 as many (…) as 和不可数的 as much(…) as 由一个倍数短语作前置修饰时，就等于 more(…) than:

Five times as many people came to the demonstration as (did) last time.

$= \$left\{ \begin{array}{ll} \text{Five times more people came to the demonstration than (did) last time.} \end{array} \right.

参加示威游行的人是上次的五倍。

I paid three times as much for the meal as they did.

$= \$left\{I\text{ paid three times more for the meal than they did.} \right.

我付的餐费是他们付的三倍。

$= \$left\{ \begin{array}{ll}\text{The Gross National Product is four times as much/high as (it was) a decade ago.}\\ \text{The Gross National Product is four times more/higher than (it was) a decade ago.}\\ \text{国民生产总值是十年前的四倍。”(CGEL, § 15.71)} \end{array} \right.

[参见 more(n times more than), times $^{1,2}$ ]