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Look at these pisture of our city.
看看这些我们城市的图片
Is our city clean?
我们的城市干净吗
No,it isn't.
不 不干净
What makes our city dirty?
什么让我们的城市变脏了
Smoke from cars makes the air dirty.
汽车尾气让空气变脏了
Black smoke from factories makes the air dirty too.
从工厂排出的黑烟也让空气变脏了
Rubbish makes the streets messy and dirty.
垃圾让街道很乱很脏
