To make Beijing our worthy capital, we must get it cleanse of polluted air, among other things.
为了使北京成为名副其实的首都，最主要的是必须彻底清楚空气污染。
One way to get rid of the polluted air is to make a car without pollution.
解决空气污染的方法之一就是制造无污染汽车。
When the aged people _____________ are exposed to polluted air or water, they are likely to get sick.
当老年人暴露在被污染的空气或水中，他们很可能会生病。
When the aged people _____________ polluted are exposed to air or water, they are likely to get sick.
当老年人暴露在被污染的空气或水中，他们很可能会生病。
When the aged people _____________ polluted are exposed to air or water, they are likely to get sick.
当老年人暴露在被污染的空气或水中，他们很可能会生病。
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