turn on doing sth.和turn on to do sth.的区别?

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turn on doing sth.和turn on to do sth.的区别?
turn on doing sth.和turn on to do sth.的区别?

turn on doing sth.和turn on to do sth.的区别?
turn on doing sth.开始做某件事情
turn on to do sth 开始要去做某件事情