irrigation main

例句：

1. 1. The irrigation system is designed to deliver water directly to the roots of the plants.
   灌溉系统设计为直接将水输送到植物的根部。
2. 2. The main stem of the tree was damaged during the storm.
   风暴期间，树的主干受损。
3. 3. The irrigation main stem is crucial for maintaining the health of the crops in the field.
   灌溉主干对于田间作物的健康至关重要。