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。
I don't know for certain why Carl Dadisman, the owner, wouldn't stop Daddy from sitting down.
我不知道出于什么原因，卡尔·达迪斯曼——这家店的店主——并不阻止爸爸坐下。
It's too soon to know for certain.
现在还太早，不知道确切情况。
But he added, he did not know for certain.
但是他补充说，他也不确定。
So, honestly, I don't know for certain yet.
所以，实话说，我都不知道究竟会是谁。
But I don't know for certain that it is false.
但我不能确实地知道它是错误的。
One thing I know for certain: Ira had it wrong.
有一件事我很清楚：Ira搞错了。
To know for certain we'd want a couple hundred years of data.
要确切地知道答案，我们就必须有近几百年的资料。
I know for certain that he's in there, but he won't answer me.
我肯定他就在里面，但他就是不回答我。
"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。”
Mr Suttles said he "did not know for certain" why it had failed.
Suttles先生说他“并不十分确定”前种方案失败的原因。
I know for certain that miracles happen, but only for those who hang on to hope.
我确信世上有奇迹，但奇迹只会发生在抱持希望的人身上。
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？
Amid all the rumor, speculation and nonsense, only you know for certain what you think and feel.
在各种流言、猜测和无稽之谈中，只有你了解自己的真实想法和感受。
But more research needs to be done before we know for certain that TwHF extract works and is safe.
不过，在我们确切地了解雷公藤提取物有效而且安全之前，还需要进行更多的研究。
I feel I've made good progress, but I don't know for certain whether or not I'm past the hump here.
到目前为止我觉得已经取得了很大的进展，我不知道我是否已经度过了最困难的事情。
However, there have been individual positive and negative studies, so it's difficult to know for certain.
然而，有个别肯定和否定研究，这对确切了解是有困难的。
If your child regresses to babyish behavior, 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。
When the rain is pouring down and my heart is hurting, you will always be around, this I know for certain.
当大雨倾盆而下，我的心受到伤害，你总会在我身旁，我深深知道这一点。
To know for certain whether praying for romantic partners strengthened relationships, they needed to go further.
想要确定是否“替情侣祈祷”真能加强情侣关系，他们还需要更进一步的实验。
The tough part about being an officer is that the troops don't know what they want, but they know for certain what they don't want.
作为军官最辛劳的一点是：士兵不知道他们想要什么，只知道他们不想要什么。
And the scientific method, with its laborious procedures and peer review, ensures we won't know for certain in the foreseeable future.
科学方法，因为其复杂的程序和需要同行互相验证，使我们无法在可预见的未来获得确切的答案。
What I do know for certain, however, is that one night, a night when he and I both needed it most, I made him laugh, and that makes me proud.
我只知道一件事：那就是今晚，是我们俩都最需要的一个晚上，我让他笑了出来，而那使我骄傲。
What I do know for certain, however, is that one night, a night when he and I both needed it most, I made him laugh, and that makes me proud.
我只知道一件事：那就是今晚，是我们俩都最需要的一个晚上，我让他笑了出来，而那使我骄傲。
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