求一句翻译！急！！！！！！

来源：百度知道 编辑：UC知道 时间：2024/06/24 15:48:26
how much do you need to increase the nitrogen concentration to affect a nine-fold increase in reaction rate。

特别是nine-fold是什么意思，怎么查也查不到，急，谢谢！！！！
为什么nine-fold就是9倍的意思呢，fold没有倍数的意思啊，具体解析一下

要增加多少氮的浓度才能使反应的速度提高九倍?
nine-fold是九倍的,九重的.

补充,
-fold 就是倍数的意思啊,是个数词,见字典解释:
suffix
having the stated number of parts, or multiplied by the stated number:
threefold
fourfold
The problems are twofold - firstly, economic, and secondly, political.
In the last 50 years, there has been a 33-fold increase in the amount of pesticide used in farming.

九倍

你需要把氮浓度增大多少来使反应速率增大九倍。

（比起来）是（它的）九倍