The original plan had undergone fairly extensive modifications.
原计划已经作了相

修改。
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源的故事
世界 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
碱的一种,生
碱是相当大的一类分子,一般来说它的环中会包含至少一个氮原子,生
碱通常会使人类及其他动
产生生理作用。