The signal (for) a race to start is often the firing of a gun.括号里的for能否改为of?
问题描述：
The signal (for) a race to start is often the firing of a gun.
括号里的for能否改为of?
答
不行。固定用法。
答
可以，【signal for】和【signal of】基本可互换，区别不大
翻译：一场赛跑的信号通常是鸣枪。
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答
这是约定俗成的用法
答
不能
注意后面的to start
要改的话应该是：the signal of a race's starting is often the firing of a gun.