Remember that picture I showed you several weeks ago?

还记得我几周前展示给你们的图片吗
Because of that for a molecule to enter

那种特点使得想要进入血液的分子
it has to be able to go through that monolayer of cells.

不得不具备能穿过那一单层细胞的能力
Even if insulin wasn't broken down to its constituent molecules

如果胰岛素没有分解为其组分分子
it couldn't be absorbed very easily because it's a large molecule.

就不能被轻易吸收的因为它是大分子
Only molecules that are small and relatively lipid soluble

只有脂溶性的小分子
can go through monolayers of cells like the epithelium of the intestine.

才能穿过像肠上皮这样的单层细胞
There's two reasons why insulin is not very bioavailable

口服胰岛素的生物利用率不高
when it's given orally.

是有两个原因的
That's one way of saying insulin doesn't end up in the blood,

也就是说胰岛素最终没有进入血液
insulin is not bioavailable when delivered orally.

导致了口服胰岛素的低生物利用率
Some drugs are aspirin, acetaminophen, Ibuprofen,

像阿司匹林醋氨酚布洛芬等