1. So far, specialists have worked to add preservative materials to the churches' exteriors. 到目前为止，专家们一直在为教堂外围添加防腐性材料。
2. The preservative used is usually ethylene glycol or propylene glycol, as alcohol will evaporate quickly and the traps will dry out. 常用防腐剂是乙二醇或丙二醇，因为随着酒精快速挥发，捕集器也随之恢复干燥。
3. A pitfall trap can be any small container placed in the ground with the top level with the surrounding surface and filled with a preservative. 陷阱可以是任何放置在地面上的小容器，其顶部与周围的表面齐平，并装满防腐剂。
4. Sugars are also carbohydrates, sources of sugars are refined sugar—sucrose, which is a food sweetener and preservative and fruit sugars—fructose. 糖类也是碳水化合物，糖类的来源是精制糖——蔗糖，它是一种食品甜味剂、防腐剂和果糖。
5. Nisin is a natural food preservative produced by certain strains of Streptococcus lactis. 尼生素是由乳酸链球菌产生的一种天然食品防腐剂。
