它本来对于我们不过是某块长着荆棘、灌木和乔木的小地方罢了。
To us it had been no more than just some little spot with thorns, bushes and trees.
不同的植物类型降温作用有差别，总的说来，树冠高大、枝叶浓密的降温作用大，乔木的降温作用大于草坪。
Different plant types have different cooling effects, in general, bigger and denser canopy has greater cooling effect, and arbor's greater than lawn's.
乔木的干形好、材质优良、较速生。
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