precursor substance

• 产物母体,先质,前身物质

precursor substance的用法和样例：

例句

1. Ergot contains the precursor chemical to LSD, so outbreaks of St.Anthony's Fire were often accompanied by terrifying mass delusions.
   麦角菌包含麦角酸二乙基醯胺化学体先质，因此圣安东尼之焰的爆发常伴随可怕的幻觉。