can't help doing 和can't help but doing的区别

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can't help doing 和can't help but doing的区别
can't help doing 和can't help but doing的区别

can't help doing 和can't help but doing的区别
can't help doing是情不自禁地做什么事情
can't help but doing好象正确的应该是can't help butdo sth意思是不得不做什么,不能不做什么 e.g.:(I cannot help but be sorry.我不能不感到遗憾.)

前者是情不自禁地做什么事情,而后者是勉强做什么事情.