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。
Like brown bears and polar bears, sloth bears may have evolved in an environment with few trees.
那时候内布拉斯加州树木稀少。
由于季节性旱涝，过度放牧和火灾，这里树木稀少。
Trees are sparse on grasslands due to seasonal floods and droughts, heavy grazing, and fires。
树木稀少的大草原，尤指东南欧和西伯利亚的干草原。
Steppe n. flat grassy plain with few trees, esp. in SE Europe and Siberia.
这里大草原的树木稀少因为季节性洪水和干旱，沉重的放牧还有火灾。
Trees are sparse on grasslands due to seasonal floods and droughts heavy grazing and fires.
由于树木变得稀少，他们不能再建造木制的独木舟来捕鱼，只好捕食鸟类。
As trees became scarce and they could no longer construct wooden canoes for fishing, they ate birds.
他认为树木也是天然的药物来源。在健康护理资源稀少并且昂贵的地区，这的确有着不小的作用。
Trees, he says, are also a source of natural medicines, no small advantage in an area where modern health care is scarce and expensive.
尼摩船长继续走人森林中最幽深的地方，沿途树木渐渐稀少。
Captain Nemo continued to plummet into the dark depths of this forest, whose shrubbery grew ever more sparse.
尼摩船长继续走人森林中最幽深的地方，沿途树木渐渐稀少。
Captain Nemo continued to plummet into the dark depths of this forest, whose shrubbery grew ever more sparse.
应用推荐