区别就是两者都是动词stay+介词短语但意思是不一样，具体的不同如下

stay in中文意思是呆在家里；不外出

Having aged relatives to stay in your house can be quite stressful.

stayon中文意思是继续停留

Olmert plans to stay on as caretaker of the negotiations while Livni works to set up a governing coalition.

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