preservative lubricating oil

例句：

1. 1.The food was preserved in a jar of vinegar.
   食物被保存在醋瓶里。
2. 2. The preservative is essential for keeping the food fresh.
   防腐剂对于保持食物新鲜是必要的。
3. 3.The preservative also helps to prevent spoilage.
   防腐剂还有助于防止变质。