另一种完全不同的理论认为，打呵欠有助于生命早期肺部的生理发育，但对成年人没有任何剩余的生理功能。

A completely different theory holds that yawning assists in the physical development of the lungs early in life, but has no remaining biological function in adults.

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它们对成年人很重要，因为有三个轮子的自行车可以帮助人移动或搬东西。

They matter to adults because bikes with three wheels can help move people or things.

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研究表明，这对成年人来说没有危险，但如果儿童戴了不适合他们眼睛的眼镜，可能会导致视力下降。

Studies show that for adults there is no danger, but children can develop loss of vision if they have glasses inappropriate for their eyes.

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So more adults were frightened of young people's access to the Internet than young people's access to the weaponry.

因此更多的成年人对,年轻人上网感到恐慌,甚于对年轻人能够接触枪支所感到的恐慌。

麻省理工公开课 - 媒体、教育、市场课程节选

So, we have stereotypes in our heads about men and women, about children, adolescents or adults, whites, blacks, Asians and so on.

所以我们有各种各样的刻板印象，对男人，对女人，对小孩，对青少年，对成年人，对白人，对黑人，对亚洲人等等。

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