That's the one thing we can say about it for sure.

这是我们可以肯定的一件事。

youdao

So, that's one way to check just for sure that this thing is not simply connected.

这是检验,该区域不是单连通的一种方法。

youdao

So, that's one way to check just for sure that this thing is not simply connected.

这是检验,该区域不是单连通的一种方法。

youdao