Like brown bears and polar bears, sloth bears may have evolved in an environment with few trees.
和棕熊和北极熊一样,树懒熊可能是在树木稀少的环境中进化而来的。
Humans have been damaging the environment for centuries by overcutting trees and farming too intensively.
几个世纪以来,人类过度砍伐树木及过度集约耕作,一直在破坏环境。
Planting trees in the desert area can keep the sand and protect the environment.
在沙漠地区种树可以保留沙子和保护环境。
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