1.For a century, this land had been overgrazed by livestock, like most grasslands around the world.

这片土地就像世界各地大部分草地一样，长达一个世纪的过放牧。

2.Elk were overgrazing the grassland, causing damage to the precious eco-system.

草原上过啃草，对宝贵的生态系统造成破坏。

3.Sharks limit the abundance of animals which would otherwise overgraze these essential plants.

鲨鱼限制动物的数量，否则这些动物会过放牧这些重要植物。机翻