The human body is a machine that has a bunch of functions, and it accumulates various types of damage as a side effect of the normal function of the machine.

人体是一个行使着多种功能的机器，它积累着各种各样妨碍机器正常功能的伤害。

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They are not considered a major hazard outside the human body, although in large doses, they can damage the cornea of the eye.

尽管大量的β粒子会造成眼角膜损害，但人们并不将其视为人体外的主要危害。

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“If the human body were exposed at very high altitude, the loss of consciousness is very fast, in five seconds, ” Marotte said. “Brain damage, in three or four minutes.”

“一个人如果身体突然暴露在非常高的高空，不出5秒，必定昏迷，”马洛特说，“三四分钟之内，大脑就会损伤。”

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In 2002 two controlled human studies stunned intensive care specialists by finding that cooling the body temperature 7 degrees helped prevent brain damage in patients whose hearts had stopped and been restarted after cardiac arrest.

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