in which case

众所周知,which 可以引导修饰句子的定语从句。

1. Sam said he saw me there, which was a lie.

萨姆说他在那儿看见我了，这纯粹是谎言。

2. Her brother snatched the letter away, at which she was furious.

她的兄弟抢走了这封信，这使她气急败坏。

3. Profits had to be increased, to achieve which object became the main occupation of business executives. 必须提高利润，追求达到这一目标成了企业经理们的主要活动。

有时候用抽象名词(fact, case, event, situation, time, failure, claim, point 等)来总结整个主句的情况或句子部分内容，而用关系代词 which 来作抽象名词的限定词，这样就和主句发生了关联。在这种情况下，which 实际上起着同位语的作用。

1. He is old, which fact is important. 他已经老了, 这个事实是很重要的。

2. The plane may be several hours late, in which case there's no point in our waiting. 飞机可能晚点几个小时, 这样, 我们再等, 也就没有意义了。

3. It rained all night and all day, during which time the ship broke in pieces. 雨下了一天一夜，就在这段时间里，船被撞碎了。

4. They were under water for several hours, from which experience they emerged unharmed. 他们在水下逗留好几个小时，但从水中出来时却安然无恙。

5. The last speaker assured the audience that the party would win the election, on which optimistic note the meeting ended. 最后一位演讲者肯定地向听众宣告:本党一定会在大选中获胜,大会就在这乐观的气氛中结束了。

6. In 1960 he came to London, in which city he has lived ever since. 1960 年,他来到伦敦,自此在该城一直住到现在。

7. He came in 1960, $\$left\{ \begin{array}{l} at which time \\ in which year \end{array} \right\} there was... 他是1960年来的，这一年发生……

8. If the medium is a solid, in which case the electrons are more tightly packed, the electron flow will be slower. 如果介质是固体(此时电子排列更为紧密), 电子流就会变慢。

9. The resistivity of most insulators decreases with an increase in temperatures, for which reason the temperatures in insulated conductors must be kept reasonably low. 大多数绝缘体的电阻系数是随温度的升高而减小,因此,绝缘体的温度必须保持相当地低。

10. Call again at 11, by which time the meeting should be over. (CGEL) 11 点钟再给我打电话, 到那个时候会议该结束了。

11. The speaker paused to examine his notes, at which point a loud crash was heard. (LEG) 讲演者停了停下来查看讲话稿，就在此时，听到砰的一声巨响。