A firefly is a type of beetle.
萤火虫是一种甲虫。
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秘籍 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.
和咖啡因一样,可可碱属于生物碱
一种,生物碱是相当大
一类分子,一般来说它
环中会包含至少一个氮原子,生物碱通常会使人类及其他动物产生生理作用。
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