at which point的用法

at which point用于引导定语从句，其意为“就在这时”“就在那时”等，在许多情况下相当于 and at that (this) moment。如：

At which point I piped up and asked whether it might be at all possible to havesome

positive input.

在此我插了一句询问这事儿是否会产生一些积极的投入。

The waiter brought him a message, at which point he left.

侍者给他带了个口信，然后他就走了。

If nothing is wrong your program will execute to completion, at which point gdb willget control back.

如果一切正常，程序将执行到结束，此时gdb将重新获得控制。

He lost his temper, at which point I decided to go home. 他发脾气了，这时我就决定回家了。

The speaker paused to examine his notes, at which point a loud crash was heard. 讲演者停下来查阅他的笔记，就在这时，听到了砰的一声巨响。

The film started to get very violent, at which point I left. 那部电影看着看着出现了极残暴的场面，我立刻就走了。

【注意】千万不能在 at which point 前加并列连词。如：

讲演者停下来查阅他的笔记，就在这时，听到了砰的一声巨响。

误：The speaker paused to examine his notes, and at which point a loud crash was heard.

正：The speaker paused to examine his notes, at which point a loud crash was heard.

正：The speaker paused to examine his notes, and at that moment a loud crash was heard.