please visit her yourself 就是"你自己去看她" 的意思.
其实by yourself 也是可以的,就是强调是你"一个人".
两种说法是是一样的意思,但是一般如果"yourself (或myself, himself, themselves...)"前面是宾语(me,her,him,them..)的话, 就省略了中间的by, 例如 "give it to him yourself"(你自己给他).
而前面不是宾语的话,例如"I'm going to school by myself",就一定要加"by"
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