and specifically what I mean is we can ask questions like what the neuro substrates support desire?

而且特别值得一提的是，我们可以问以下问题,哪些神经物质让人产生欲望？

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The digestive system, of course, is responsible for bringing in sort of fresh nutrients, fresh substrates for cellular metabolism, fresh quantities of amino acids, and nucleotides, and the things that we can't generate internally.

当然,还有消化系统,它主要负责将各种新鲜营养物摄入体内,为细胞代谢提供新的底物,如一批新的氨基酸,核苷酸,以及那些人体无法自行合成的东西

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