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。
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.
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.
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