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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.
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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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I know for a certainty that he will be here in time.
我肯定他会准时到这里来的.
英汉双解词典包含4367426条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。