You can use saline to preserve food.

你可以用盐水来保存食物。

Common salt can be used to preserve food.

氯化钠可以用来腌制食物。

Congelation can preserve food for a longer period.

冻结可以使食物保存更长时间。

Ice helps to preserve food.

冰能帮助保藏食物。

Preserve food and clothes in oxygen free air

用缺氧空气保存食品和衣服

No one knows for sure how people first learned to preserve food.

没有人确切地知道当初人们是如何学会保存食物的.

Three. Historically, salt's value came from its ability to preserve food.

在历史上，盐的价值来自于它储存食物的能力。

With discoveries in methods to preserve food, almost every kind of food can be frozen and yet keep its original flavor.

冷藏食品的各种方法问世以来，几乎各种食品都可以冷冻并且能保存原滋原味。

Dilution of others may affect the outcome. Try to add and extend the knowledge and understand how you can preserve food by doing the CO2 or copper oxide.

所以经过稀释，也许会反映在结果里，去理解透过CO2或是氧化铜甘斯保存食物，试着多做实验以延续或是增加这个的知识。