When they sense the sheep grazing, they pop their ugly heads out of the ground and bite the sheep on the nose.
当它们闻到了羊的气味，就会从洞里探出它们那丑陋的头，在羊的鼻子上咬一口。
2
Long - term heavy grazing simplified the alpine shrub community and decreased the standing above - ground biomass, especially palatable herbage plants.
长期重度放牧使高寒灌丛群落结构简化，地上现存生物量特别是优良牧草的现存量减少。
3
Grazing not only directly affects above ground part of grass communities and grassland soil, also indirectly influences underground productivity and material turnover.