A firefly is a type of beetle.
萤火虫是一种甲虫。
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Like caffeine, theobromine is a type of alkaloid, which is a huge class of molecules that generally contain rings with at least one nitrogen atom in them, and alkaloids often have physiological effects on humans and other animals.
和咖啡因
样,可可碱属于生物碱的
,生物碱是相当大的
类分子,
般来说它的环中会包含至少
个氮原子,生物碱通常会使人类及其他动物产生生理作用。
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