Some methods of preserving food are easy to understand.
一些保存食物的方法很容易理解。
For example, it's easy to see that freezing your food, or packing it in salt, would make it inhospitable to the microbes which would otherwise cause it to spoil.
比如，把食物冷藏，或者用盐腌起来，都是很常见的方法。通过这些方法，不给细菌提供滋生的环境，以防止食物腐败变质。
You might wonder, however, about jams, jellies, and preserves, all of which are protected from spoiling by a high concentration of sugar.
不过，果酱，果冻和蜜饯都是用高浓度的糖来防止其变质的，你可能对此感到疑惑。
Sugar is one of the most basic foods for all life-
