preservative|preservatives

这种特殊的防腐剂可以延长食物的保质期。

This special ___preservative can extend the shelf life of food.

这些果酱添加了天然防腐剂来保持新鲜。

These jams have natural ___preservatives added to stay fresh.

这种罐头食品不含任何人工防腐剂。

This canned food doesn't contain any artificial ___preservatives.