盐和糖的保质期，远比你想象的长

Many of the foods that last for a long time are high in sugar and salt.

很多保质期很长的食物都含有很多糖和盐。

In simple terms, they draw water out, so if bacteria try to grow on it, they will simply shrivel up.

简单讲，这是因为它们能把水分吸出来，所以如果细菌尝试在上面生长就会失水变干。