这个假设是这样的：安静的人之所以安静是因为他们不知道说什么，或者怎么说。

The assumption here is that quiet people are quiet because they don't know what to say, or how to say it.

youdao

这家披萨店的老板特洛伊·泰勒发现，很多家长不能控制自己的孩子，很多孩子不能安静地吃饭，所以他们打扰其他顾客。

Troy Taylor, the owner of the pizza restaurant, found that many parents couldn't control their children and many children couldn't have meals quietly, so they disturbed other customers.

youdao

燃料电池即安静又清洁，又可连续运行，所以企业很快可以收回成本。

Fuel cells, which are quiet and clean, can run continuously, so companies can recover their investment more quickly.

youdao

And that's how it actually gets to be so quiet when you have on, supposedly, these quite expensive headphones.

所以你戴上它后会觉得,周围非常安静，可想而知,这种耳机非常贵的。

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So it's really nice to have quiet, green space you can go to,

所以有一个安静的、充满绿色的地方可去真的很好，

讲述伦敦的生活 - SpeakingMax英语口语达人

and she's a little skittish just because of her history.

所以这段经历让她性格有点安静。

与流浪狗的相遇 - SpeakingMax英语口语达人