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The current, which is very rapid, makes the river dangerous．水流湍急使这条河变得很危险。
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有时which不代表一个词，而代表前面整个句子或其中一部分：
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This I did at nine o’clock, after which I sat reading the paper．九点时我做这件事，之后我就坐在那里看报。
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They rely on themselves, which is much better．他们依靠自己，那就好得多。
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He has to work on Sundays, which he doesn’t like．他得在星期天工作，他是不喜欢这样的。
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which有时作定语：
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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。
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Tom spent four years in college, during which time he learned French．汤姆读了四年大学，在此期间他学了法语。
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which还可引导一个不定式短语作定语（作用和定语从句差不多）：
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He had only the long nights in which to study．他只有漫漫长夜可用来学习。
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He had a couple of revolvers with which to defend himself．他只有一两把手枪用来自卫。
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whichever可用作代词，引导从句作主语或宾语，表示“无论哪个”：
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Whichever (of you) comes in first will receive a prize．无论（你们）谁先到都可以得奖。
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Whichever you want is yours．你要哪个哪个就是你的。
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Buy whichever is cheapest．哪个最便宜就买哪个。
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Take whichever you like．哪个你喜欢你就拿哪个。
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还可引导从句作状语，表示“不管哪（个）”：
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Whichever side wins, I shall be satisfied．不管哪边赢，我都会感到满意。
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It has the same result whichever way you do it．不管你怎么做结果都一样。
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Whichever you choose, they will be offended．不管你选哪个，他们都会不高兴。
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914 while—whilst
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while有以下几种用法。
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（1）while是连词，引导从句作状语，表示“当……的时候”：
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You must strike while the iron is hot．你必须趁热打铁。
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