in which case主要用于引导非限制性定语从语，相当于 and in that / this case，其意为“如果是那样 / 这样的话。如：
She may be late, in which case we ought to wait for her. 她可能迟到，因此我们应该等她。
He may be busy, in which case I’ll call later. 他可能忙，如若如此，我以后再来拜访。
I may have to go into hospital, in which case I won’t be going on holiday. 我可能要住院，如果那样我就不去度假了。
I may have to work late, in which case I’ll telephone. 我可能得晚点下班，那样我会打电话的。
Sometimes feta is very salty, in which case no salt needs to be added. 有时，羊奶干酪很咸。如果这样的话，就不必加盐了。
【注意】不能想当然地在 in which case 加上并列连词。如：
我可能要住院，如果那样我 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：
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.就不去度假了。
误：I may have to go into hospital, and in which case I won’t be going on holiday.
正：I may have to go into hospital, in which case I won’t be going on holiday.
正：I may have to go into hospital, and in that case I won’t be going on holiday.
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