perester

例句：

1. 1.The food was kept in a perester to prevent spoilage.
   食物被放在防腐剂中以保持新鲜。
2. 2. The chemical used as a perester is known as benzoic acid.
   用作防腐剂的化学物质是苯甲酸。
3. 3. The perester in the jar helps to keep the food fresh for several days.
   瓶中的防腐剂有助于使食物保持新鲜几天。