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1.描述特定时间的特征――由when 或介词＋which 引导定语从句：
This was the moment when/at which Spielberg’s career really took off.
2.描述特定地点的特征――由where 或介词＋which 引导定语从句：
Chuck survives the air crash and lands on a deserted island where/ on which there are no people.
3.描述特定原因或理由的内容――由why 或介词+ which 引导定语从句：
The reason why/for which Steven Spielberg could not go to the Film Academy was that his grades were too low.
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