We must plant more trees and grass, they can make the world greener.
我们必须种植更多的树木和草地，他们可以让世界更环保。
We must plant more trees and grass, they can make the world greener.
我们一定要种更多的树和草，它们可以让世界更绿。
We must plant more trees and grass, they can make the world greener.
我们必须种植更多的花草树木，它们能让世界充满绿色。
The green grass and trees, flowers, can make the air more fresh;
绿色的小草和树木、鲜花可以让空气变得更新鲜；
The green grass and trees, flowers, can make the air more fresh;
绿色的小草和树木、鲜花可以让空气变得更新鲜；
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