You're right. It's dirty from all the dust and sand blowing around in the wind.
对啊。一刮风，就有很多尘土和沙子，太脏了。
Trees can stop the wind from blowing the earth away. They can also prevent the sand from moving toward the rich land.
树可以防止风把泥土吹走，也可以阻止风沙吹进良田。
They can stop the wind from blowing up sand and...
它们能阻止风吹走沙石和土壤。
They can stop the wind from blowing up sand and...
它们能阻止风吹走沙石和土壤。
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