You never met them in the air or on tree-tops.
你从未在空中或树梢上见过它们。
Please write about the effect of tree planting on air in a city.
请写写植树对城市空气的作用。
The green tree, the colorful flower, the clean water even the fresh air.
绿色的树，五彩缤纷的花朵，干净的水甚至是新鲜的空气。
County a beautiful environment, tree-Yam, fresh air, the forest coverage rate reached 37%.
全县环境优美，绿树成阴，空气清新，森林覆盖率达到37%。
If everybody plants a tree, the air will be clean someday.
如果每个人种一棵树，空气就会变干净一些。
The tree really enjoyed the fresh air.
枞树高兴地享受着新鲜的空气。
Whatever water is not used by the tree is then released back into the air.
未被消耗的水又被释放回空气中。
The water is clearer, the tree is greener, and the air is fresher.
水更清了，树更绿了，空气更清新了。
The ball flies through the air. It hits a tree, and rolls down the hill.
球飞到半空中，撞到一棵树，然后就滚下了山坡。
The ball flies through the air. It hits a tree, and rolls down the hill.
球飞到半空中，撞到一棵树，然后就滚下了山坡。
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