Asthma causes wheezing and breathlessness.是什么意思？

Asthma causes wheezing and breathlessness.

哮喘会造成气喘和呼吸困难。

asthma

n. <医>气喘，哮喘；

例句
One GP has charted a dramatic rise in local childhood asthma since the M25 was built nearby...
一位全科医生跟踪记录发现，自从附近修建了25号高速公路以来，当地哮喘病患儿数量急剧增加。

causes

n. 原因( cause的名词复数 )，动机，（某种行为、感情等的）理由，缘故；

例句
Allergy to cats is one of the commonest causes of asthma.
对猫类过敏是哮喘病发作最常见的诱因之一。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

breathlessness

气绝；

例句
There had been no indication of either breathlessness or any loss of mental faculties right until his death.
他去世前并未出现呼吸困难或意识不清的迹象。