They're small molecules that - whose principal function in the body is to carry signals from one cell in the nervous system to another.
它们都是小分子,在体内主要功能是在,神经系统内将信号,从一个细胞传导到另一个细胞
You konw, the British practicing mercantilism passed navigation acts, saying what ships could carry what and so on -nothing like that in the Greek world.
例如英国以颁布《航海法》,来体现重商主义,他们认为船能带来各种各样的财富,但在希腊不是这样
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