We often hear people say, "What's past is past. Let’s look to the future. "

我们常听人说：“过去的已经过去了，让我们展望未来吧！”

That's because what has happened has happened

这是因为已发生的事都已发生了，

and if we can’t do anything about it, it,s already a waste of time to dwell¹ on the past.

如果我们无可奈何，那么怀念过去是浪费时间。

As the saying goes, "It's a waste of time thinking hard about the past. There's nothing you can do to change it. "

俗话说：“缅怀过去是无用的；过去的事你已无法逆转。”