Keep holding down that first Alt key, and then press Tab.

保持第一个Alt按下，然后再按tab键。

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Keep a TAB of the number of words that you have mastered.

将你已经掌握的单词数量做一个标签。

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We have to keep a close TAB on daily sales.

我们必须仔细登记每日售量。

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We have to keep a close TAB on daily sales.

我们必须仔细登记每日售量。

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