The best public speakers always know when.

最好的公众演说家总是知道合适的时机。

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What I do is I always know who I am writing for, I always know the ensemble or the soloist.

VOA: special.2010.07.12

I always know something first as something.

我在一开始知道某物时就知道它是某物了。

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So I always know what's going on.

所以我总是知道正在发生什么。

时间管理很重要 - SpeakingMax英语口语达人

What if appliances could always know the time, outside temperature, and current energy rates?

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But when it comes to technology's evolving platforms and ethical codes, parents don't always know best.

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Set clear, measurable goals with employees so they always know what is expected of them.

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