grazing ecology

例句：

1. 1. The herdsman watchesover the animals as they graze inthe meadow.
   牧民在草地上看着动物们吃草。
2. 2. Grazing is an important partof the ecosystem.
   放牧是生态系统的一个重要部分。
3. 3. The grazingland is being converted into farmland.
   放牧土地正在被转化为农田。