He had been there four times to my certain knowledge.

我确定他去过那儿4次。

辞典例句

Decent appearance and manner, know certain knowledge of tea.

形象气质佳, 懂一定的茶水知识.

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Second , the main contents of certain knowledge discussed in logical atomism.

逻辑原子主义关于确定性知识的主要内容.

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With certain knowledge in quality system management.

有一定的品质系统管理知识.

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Certain knowledge of mechanical engineering.

有一定的机械工程知识.

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And we can do all that in the certain knowledge that what arrives will not work.

这些我们都可做到并肯定会收到货不对板.

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Very good at mechanical design, and have a certain knowledge of automatic control.

非常强的机械方面设计能力, 并有一定的自动化控制知识基础.

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