preservative agent

例句：

1. 1.The food was preserved in a jar of vinegar.
   食物被保存在醋的罐子里。
2. 2.The preservative agent is essential for the food's shelf life.
   防腐剂对食品的保质期至关重要。
3. 3. The preservative agent helps to keep the food fresh and prevent spoilage.
   防腐剂有助于保持食品新鲜，防止变质。