是定语从句,句中的for which意思相当于because.表示原因,此句翻译成 延长一段时间,因为它是有效的.用for which 的原因是因为前面的extend ,从句中的动词extend跟这个介词for 是要搭配的例如：The paper on which ...
you extend the period of time for which it is valid. 这是什么从句?
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