irrigation of external auditory canal

例句：

1. 1.The farmer used to irrigate the fields with rainwater every day.
   农民过去每天用雨水来灌溉田地。
2. 2.The irrigation system is designed to prevent soil erosion.
   灌溉系统被设计用来防止土壤侵蚀。
3. 3. The farmers need to irrigate their crops regularly to ensure a good yield.
   农民需要定期灌溉作物以确保高产。