As the severity of the obstruction to expiratory flow increases, patients become increasingly dyspneic.是什么意思？

As the severity of the obstruction to expiratory flow increases, patients become increasingly dyspneic.

随着呼气性阻塞越来越严重, 病人的呼吸困难也逐渐加重.

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。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

severity

n. 严重，严格，严谨，严厉的对待；

例句
Like most cases of extreme weather, its severity was due to an unusual confluence of events.
如同大多数极端天气状况一样，其剧烈程度是由于几种气象条件反常地汇集在一起造成的。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

obstruction

n. 障碍物，阻碍的行为或例子，阻碍，受阻，妨碍议事；

例句
The boy was suffering from a bowel obstruction and he died.
这个男孩因患肠梗阻死去了。

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。

expiratory

adj. 吐气的，呼气的；

例句
As the severity of the obstruction to expiratory flow increases, patients become increasingly dyspneic.
随着呼气性阻塞越来越严重, 病人的呼吸困难也逐渐加重.

flow

vi. 流，垂，流出，（谈话、文体等）流畅；n. 流动，滔滔不绝，涨潮，连贯；vt. 使泛滥，淹没，排出；

例句
The flow of current actuates the signal.
电流发出了信号。

increases

n. 增加量( increase的名词复数 )；v. 增加，增大，增多( increase的第三人称单数 )，增强，增进，[缝纫]放（针），增强；

例句
Vitamin C increases the absorption of iron from food.
维生素C促进食物中铁的吸收。

patients

n. 患者( patient的名词复数 )，接受治疗者，受动着，承受者；

例句
...a Code of Practice that would give patients right of access to their medical records.
允许病人查看自己病历的职业准则

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

increasingly

adv. 越来越多地，日益，格外，越来越…，愈；

例句
Theirs had been an increasingly attenuated relationship.
他们的关系日益冷淡。

dyspneic

呼吸困难的；

例句
The next morning the patient became extremely dyspneic and weak.
第2天早晨,病人呼吸变为非常困难和衰弱.