But he added, he did not know for certain.
但是他补充说，他也不确定。
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 do not know, for certain, what they mean.
我不知道他们所说的确切含义。
As for me a certain unfairness can say, you said, you did not know.
至于我一定不公平，可以说，你说，你不知道。
As for me a certain unfairness can say, you said, you did not know.
至于我一定不公平，可以说，你说，你不知道。
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