Studies show that for adults there is no danger, but children can develop loss of vision if they have glasses inappropriate for their eyes.
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。
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.
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。
It's no surprise, then, that more than half of American adults don't get the 7 to 9 hours of shut-eye every night as recommended by sleep experts.
因此，超过半数的美国成年人没有按照睡眠专家的建议每晚合起眼睛睡7到9个小时，就不足为奇了。
It's no surprise, then, that more than half of American adults don't get the 7 to 9 hours of shut-eye every night as recommended by sleep experts.
因此，超过半数的美国成年人没有按照睡眠专家的建议每晚合起眼睛睡7到9个小时，就不足为奇了。
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