这是对人如果回到过去就会改变历史进程的担忧。
This is the worry that someone could go back in time and change the course of history.
词汇曾经改变历史进程，同样也能改变人生方向。
Words have changed the direction of history. Words can also change the direction of your life.
一场好的演讲可能改变历史进程，或改变整整一代人的命运。
A good speech has the power to change the course of history or affect an entire generation to change their lives.
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