a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat
choline详细解释
cho.line n.（名词）A natural amine, C5H 5NO 2, often classed in the vitamin B complex and a constituent of many other biologically important molecules, such as acetylcholine and lecithin. 胆碱：一种天然的碳氢基氨，C5H 5NO 2，经常归类为维生素B复合体并且是许多其他生物重要分子的组成部分，如乙醯胆素和卵磷脂
