1.What's the matter, Kitty? Are you crying?
1.凯蒂，怎么了？你在哭吗？
I'm not crying. My eyes hurt. It's the smoke.
我没有哭，我的眼睛受伤了，是烟伤的。
Where is the smoke from?
烟来自哪里？
It's from the cars and buses.
它来自小汽车和公共汽车。
Look at the black smoke from the factory. It makes the air dirty.
看工厂冒出的黑烟，它使空气污劣。
Let's go to the park, Ben. The air is clean there.
本，我们去公园吧，那儿的空气干净。
OK.
好的。
2.The air is so fresh here.
2.这儿的空气太清新了。
Yes. There are a lot of trees in the park. Trees keep the air clean.
是的，公园里有许多树，树保持空气洁净。
We should plant more trees and keep the air clean.
我们应该多种树，保持空气的洁净。
Yes! We should keep our city clean.
是的！我们应该保持城市整洁。