That is the crucial point.

这才是关键点。

This is a crucial point.

这一点很重要。

This is perhaps the most crucial point of all.

这也许是最重要的关键点。

The crucial point is that it goes at the end.

至关重要的一点是，它不用结束时才点击。

By reasoning in language, that's the crucial point here.

这里的重点是，通过语言进行推论。