But Mark knew that he should proceed with caution.

但马克知道，自己必须小心行事。

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Mark knew that his goose was cooked when his girlfriend found him dating another girl.

当马克被女友发现他移情别恋时，他知道自己完了。

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Deep inside, Mark knew that many of us had reached our ceilings.

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Mark Twain knew this when he was newspaper editor at the Virginia City Territorial Enterprise.

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The police knew Mark, as he had had a lot of small accidents, but they also knew him by name and reputation.

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