she has no friends and goes for long walks by herself.goes for long是固定用法吗herself前面为什么加by

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she has no friends and goes for long walks by herself.goes for long是固定用法吗
herself前面为什么加by

go for walk 是固定用法,意为散步.long指路程长的,修饰walk.
by是by oneself 的介词,by herself 意为她自己.

by herself是一个词组