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Perspiration, the bodys built-in cooling mechanism occurs as a natural reaction to nervousness, intense heat, or vigorously exercise.

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Salmon spend most of their adult lives in salt water, despite they return to their freshwater birthplaces to spawn and die.

关于毒品的概念，国内与国外是统一的。 ()

按照毒品对人体毒性的危害进行分类，海洛因和苯丙胺类属于软性毒品。 ()

The old man is very pleased to be told that his daughters and son-in-laws are going to see