来自《耶鲁大学开放课程：生物医学工程探索第2集第2集》

where the water soluble part of the lipid points out of this layer

水溶性部分朝向膜层外
and the oily part points in.

而脂溶性的部分朝向双层膜内部
The fascinating part about this layer is that

这层膜的迷人之处在于
it solves the problem for phospholipids about

它解决了磷脂
how to exist in water when half of you wants to be in oil,

如何存在于水中和油脂中的问题
and that the water soluble part of the top leaflet here,

水溶性的顶端部分
of the top points up into the water,

向上插入水中
and the fatty acid chains point down.

而脂肪链则指向下
The opposite leaflet does the other thing,

相反的部位则有不同的情况
the water soluble part points down and the fat points up,

水溶性部分向下而脂肪向上
so now you have thin region of fat

所以现在就得到了
which is surrounded on both sides by water.

两侧均被水包围的薄层脂肪区域