rotation grazing cycle

例句：

1. 1. The rotation of the seasons is essentialfor maintaining a healthy ecosystem.
   季节的轮换对于维持一个健康的生态系统至关重要。
2. 2. The rotationof crops in this region ensures that wehave enough food for the year.
   该地区作物的轮换确保了我们全年有足够的食物供应。
3. 3. The rotation of resources helps to preventoveruse and degradation of natural resources.
   资源的轮换有助于防止自然资源的过度使用和退化。