时差N小时 嘴唇为何会干?(上)

Let's start by reviewing the ways in which the surface of our lips is different from the surface of the skin on the rest of our bodies.

我们首先看下嘴唇表面与我们的身体其余部分皮肤的不同。

Basically, our lips are made of the same mucus membrane¹ that coats the inside of our mouths.

基本而言,我们的嘴唇由保护我们嘴部的相同粘液膜组成。

This means two things.

这意味着两件事。

First, our lips don't have the same protective outer layer as the skin elsewhere on our bodies.

首先,我们的嘴唇没有同身体相同的外层保护皮肤。

This layer is part of the barrier to evaporation², and its absence means our lip skin retains less fluid.

这一层能够抵挡水分蒸发,而它的缺乏意味着我们的嘴唇皮肤只能留存较少的液体。

Second, our lips don't have the same glands³ and pigments⁵ as ordinary skin.

第二,我们的嘴唇没有普通的皮肤所具有的腺体和色素。

For example, lips don't have oil glands, which also help keep moisture from evaporating, and they contain less melanin, the pigment⁴ that helps protect our skin from sunburn.

比如嘴唇没有也有助于防止水分蒸发的油腺,而且嘴唇含有更少的黑色素,这种色素能够帮助保护皮肤免受太阳灼伤。

1 membrane   

n.薄膜，膜皮，羊皮纸

参考例句：

• A vibrating membrane in the ear helps to convey sounds to the brain.耳膜的振动帮助声音传送到大脑。
• A plastic membrane serves as selective diffusion barrier.一层塑料薄膜起着选择性渗透屏障的作用。

2 evaporation   

n.蒸发，消失

参考例句：

• Be careful not to lose too much liquid by evaporation.小心不要因蒸发失去太多水分。
• Our bodies can sweat,thereby losing heat by evaporation.我们的身体能出汗，由此可以蒸发散热。

3 glands   

n.腺( gland的名词复数 )

参考例句：

• a snake's poison glands 蛇的毒腺
• the sebaceous glands in the skin 皮脂腺

4 pigment   

n.天然色素，干粉颜料

参考例句：

• The Romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。
• Who thought he might know what the skin pigment phenomenon meant.他自认为可能知道皮肤色素出现这种现象到底是怎么回事。

5 pigments   

n.（粉状）颜料( pigment的名词复数 )；天然色素

参考例句：

• The Romans used natural pigments on their fabrics and walls. 古罗马人在织物和墙壁上使用天然颜料。 来自辞典例句
• The original white lead pigments have oxidized and turned black. 最初的白色铅质颜料氧化后变成了黑色。 来自辞典例句