trephination and irrigation

例句：

1. 1. Trephination and irrigation are essential for plant growth.
   凿孔术和灌溉对于植物生长至关重要。
2. 2. Trephination and irrigation are used to control soil moisture.
   凿孔术和灌溉用于控制土壤湿度。
3. 3. Trephination and irrigation are necessary for maintaining healthy soil.
   凿孔术和灌溉对于保持健康土壤是必要的。