maintenance of soil fertility

例句：

1. 1. The car needs regular maintenance to ensure its longevity.
   这辆车需要定期维护，以确保其持久性。
2. 2. The team is responsible for maintaining the equipment in good working order.
   该团队负责确保设备处于良好工作状态。
3. 3.Maintaining a healthy diet is crucial for maintaining good health.
   保持健康的饮食对于保持健康至关重要。