Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.

色氨酸，一种非常重要的氨基酸，也是血清素(让人感觉良好的化学物质)的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。

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Foods that contain a substance called tryptophan, which is converted to an amino acid called L-tryptophan, promote sleep.

食物中含有一种称为色氨酸的物质，它可以转化为一种能促进睡眠的氨基酸—l -色氨酸。

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The manufacture involves a microbial process by which some of the milk sugar lactose is converted to lactic acid.

制造涉及微生物的过程，其中的一些牛奶中的乳糖转化为乳酸。

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