城市污染严重是由于过多的汽车排放造成的,绿化能减少空气污染.
The severe pollution of the city is caused by too much auto exhaust and the afforestation can reduce the air pollution.
绿化我们的城市是非常重要的事情,必须从每一个人做起.
The afforestation of our city is of great importance and must start from everyone.