确实无疑地;确确实实;
I know for a certainty that the company has been bought up.
我确实知道公司已经被人收购了.
I know for a certainty that he will be here in time.
我肯定他会准时到这里来的.
The cause of trouble with the machine is not known for a certainty.
那部机器的故障原因还未确知.
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