A kind of easy measuring tool for big gear is introduced.

介绍一种测量大齿轮的简易工具。

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If the big gear did not engage with the small one, the machine would refuse to work.

如果大齿轮与小齿轮不相啮合的话，机器就不会工作。

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If I see a bunch of sick people, maybe a big infection is around, and I better kick my immune system into high gear.

如果我看到一群病患，这里有可能有传染病，那么我最好把自己的免疫系统再开高一个档。

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If I see a bunch of sick people, maybe a big infection is around, and I better kick my immune system into high gear.

如果我看到一群病患，这里有可能有传染病，那么我最好把自己的免疫系统再开高一个档。

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