Please park your cars on the fourth floor, where we have 500 parking lots.
后一句是修饰floor的定语从句，必须加引导词where。in 最好也换成on。
Please park your cars 【on】 the fourth floor. We have 500 parking lots there.
请将你的车停放在四楼，在那我们有500个停车位。
Please park your car on the fourth floor. We have 500 parking spaces.
cars 改为car in 改为on lots改为spots
两个句子 而且意思没有相关性
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