他们阻止人们在城市里的房子和工厂里燃煤，阻止人们把脏烟排放到空气中。
They stop people from burning coalin houses and factories in the city, and from putting dirty smoke into the air.
这所房子太脏了！它里面有很多积尘。
邮递员说：“先生，你的房子很好，但是窗户有点脏。你可以清洗它们，使其变得更美好。”
The mailman said, "Sir, your house is wonderful, but the windows are a bit dirty. You can make it more wonderful by cleaning them."
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