What this means is that our lips have little to no protection from the environment, and their main source of moisture is the saliva that comes from our mouths.
这就说明嘴唇易受环境影响，而嘴唇水分大多是来自嘴里的唾液^GZ)EcGz)9+DLD。
What’s more, unlike much of the rest of our body, our lips are almost always on display, and rarely covered by clothing.
此外有别于身体其他部位，嘴唇直接暴露在外面ZK^;2M(g4@]lt6DY].D。

As a result, the moisture on our lips is continually evaporating.
结果就造成嘴唇的水分一直在蒸发EQn-Gw*1,r*X]SU+kI。
And that’s before we take into account exposure to sun, wind, cold, and air-conditioning.
我们的嘴唇还要暴露于阳光、大风、冷空气及空调环境oq3JT84y,3_。
Plus, if you’re sick or have allergies, and your nose is congested, your lips end up drying more quickly because you tend to breathe through your mouth.
此外，如果你生病或者过敏而鼻塞，嘴唇会干得更快，因为你不得不大口呼吸！