know for certain的意思|示意

If your child regresses to babyish behaviour, all you know for certain is that the child is under stress.

如果你的孩子退步到幼稚的行为，你可以肯定的是孩子正处在压力之下。

No, if we admit that notion, then is there anything we can say we know for certain?

不，如果我们承认了这个观点，那是不是就没有任何东西可以说是我们确定认知的了？

The truth is we can't ever know for certain what other people are thinking about us.

而事实是我们无法确知他人是如何看待我们的。

We don't know for certain. But what might have happened to lead to the two different editions?

我们不能确切知道，但可能发生过什么，导致了这两个不同版本？

"But," he said, "It's very, very difficult to know for certain."

“但是，”他表示说，“这是非常非常难以说清楚的。”

It's too soon to know for certain.

现在还太早，不知道确切情况。