vitamin A 2

vitamin-a-2的词性：
n.（名词）

1. A golden yellow oil, C₂₀H ₂₈O, occurring chiefly in the livers of freshwater fish and having about 40 percent of the biological activity of vitamin A ₁.
维生素A2：一种金黄色油，C₂₀H ₂₈O，主要存在于淡水鱼的肝脏中，有维生素A ₁的百分之四十的生物活性