This factor must precede an ice age and have the effect of slightly lowering Earth's temperature.

这一因素一定出现在冰川期之前，并有稍微降低地球温度的效果。

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Earlier experiments had demonstrated this effect, but it was unclear whether the gas was doing this itself or was acting indirectly by lowering body temperature, which also reduces metabolism.

早期的实验证明了这种现象，但是并不明确是由于硫化氢本身所起的作用，还是因为其间接的降低了老鼠的体温，从而导致新陈代谢的减缓。

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Studies find that theophylline in tea leaves can raise the body temperature, so drinking tea during a fever is not only bad for lowering body temperature, but also weakens the effect of medicine.

研究证明，茶叶里所含的茶碱会提高人的体温。发烧的病人如果喝茶不但不利于降体温，还会因喝茶而使降温药的作用大打折扣。因此，感冒发烧的病人不宜喝茶。

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