Only take such clothes as are really necessary.这句语什么意思

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Only take such clothes as are really necessary.这句语什么意思
尤其请帮我分析一下,as在句中到底作什么,引导什么从句.为什么都没有主语?不胜感谢.

such...as意为“像.一样.”其中such是形容词,后接名词,as是关系代词,引导定语从句,在定语从句中可充当主语、宾语、标语.如:Let's discuss only such questions as concern every one of us.我们只谈与我们每个人都...