she cooked the whole meal by herself,为什么用by,能否省略?什么情况下用by
问题描述：
she cooked the whole meal by herself,为什么用by,能否省略?什么情况下用by
答
by herself是个短语,on her own,或者alone,或者without other people's help.中文是：靠自己,全靠自己.