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。
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。
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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