蜂蜜是糖的饱和溶液，故可吸收水分，从而使细菌脱水，令其无法生存和繁殖。
Because honey is composed of saturated sugars, it sucks up water, depriving bacteria of the liquid they need to survive and multiply.
如果含水量达到饱和状态的空气遇到了非常冷的另一团空气，空气中的原先呈雾状的水分就开始凝结变成小的雪粒。
If a stratum of air saturated with moisture meets a very cold one, the fog begins to freeze, and becomes specks of snow.
另一方面，如果你见到一条常常的痕迹在空中持续一段很长的时间，这意味着大气层的水汽已经饱和不能在继续吸收多余的水分了。
On the other hand, if you see a contrail that lasts a long time, this means the upper atmosphere is already saturated with as much water vapor as it can hold.
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