VOA慢速英语:Breathing Easier: How to Control Asthma

1. Asthma affects not only millions of individuals, but families and economies alike.

not only...but... 不但…而且
例句：That was not only understandable but inevitable.
这不仅可以理解，而且也是无法避免的。

2. They say it feels as if someone is sitting on them.

as if 好像
例句：As if they were going to find him!
好像他们真能找到他似的！

3. The disorder can severely limit a person's activity, and even lead to death.

lead to 导致
例句：This may even lead to death.
这甚至可能导致死亡。

4. Pollen is a fine dust that comes from grass, trees and flowers. Mold is a kind of fungus.

come from 来自某处；出生于
例句：The girls come from a variety of different background.
姑娘们的出身背景各异。

5. They should make sure they understand how and when to take their medicines.

make sure 把事情弄清楚，核实或查明某事物
例句：How do you make sure this is clear?
你怎么能确定这足够明确呢？