As dilatation occurs, capillaries become abnormally permeable to proteins.是什么意思？

As dilatation occurs, capillaries become abnormally permeable to proteins.

随着扩张的发生, 毛细血管对蛋白变得异常地易于渗透.

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

dilatation

n. （中空器官或空洞）扩张，膨胀，扩张过程，膨胀过程；

例句
PROGRESSIVE BALLOON DILATATION UNDER ENDOSCOPE FOR ACHALASIA ( 32 Cases Reported )
直视下内镜旁球囊逐级扩张治疗贲门失驰缓症临床研究 ( 附32例报告 )

occurs

v. 发生( occur的第三人称单数 )，被想起，被发现，（尤指基督教节日与别的节日）适逢同日；

例句
The cry occurs when air is brought into contact with the baby's larynx...
婴儿的喉咙接触到空气时，就会哭出来。

capillaries

n. 毛细管，毛细血管( capillary的名词复数 )；

例句
Bilberry extract benefits the capillaries in the body to help peripheral circulation.
越桔萃取物有益于血丝在身体帮助周边循环.

become

vi. 变为，成为，变得，变成；vt. 适合，适宜，相称，相当，变成，发生；

例句
...abandoned buildings that become a breeding ground for crime.
沦为了犯罪温床的弃置楼群

abnormally

adv. 不正常地；

例句
She suggests that women are under constant pressure to be abnormally thin...
她暗示说女性总是处在保持身材异常瘦削的压力之下。

permeable

adj. 可渗透的，具渗透性的；

例句
A number of products have been developed which are permeable to air and water.
已开发出许多可渗水透气的产品。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

proteins

n. 蛋白质( protein的名词复数 )；

例句
Food is made up of carbohydrates, proteins and fats.
食物由碳水化合物、蛋白质和脂肪构成。