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The river is dirty.
河流很脏
There's rubbish in the water and the fish are dead.
水里有垃圾 而且水里的鱼都死了
What can we do to keep our city clean?
我们能做什么来保持城市的干净呢
We can take the bus and the metro to school.
我们可以乘坐汽车和地铁上学
We can walk to school too.
我们还可以走路上学
We can move some factories away from our city.
我们可以把一些工厂搬到离城市很远的地方
We can put rubbish in the bin.
我们可以把垃圾扔进垃圾箱
We can plant more trees.
我们可以种更多的树
They help keep the air clean.
他们可以帮助保持空气的干净
Your ideas are great.
你们的想法都很棒
Well done,class.
不错不错 同学们
