preservative substance

• 防腐剂,杀菌剂

preservative substance的用法和样例：

例句

1. Salt is a preservative for meat.
   盐是肉类的防腐剂。
2. Tannin acts as a natural preservative that helps wine age and develop.
   单宁作为一种天然的防腐剂有助于葡萄酒的陈年和发展。