sector rainer

例句：

1. 1. The sector rainer is an important tool for flood control.
   扇形降雨器是防洪的重要工具。
2. 2. The rainer was designed to collect rainwater for irrigation purposes.
   这种降雨器被设计用来收集雨水用于灌溉目的。
3. 3. The sector rainer has been proven to be highly effective in reducing soil erosion.
   扇形降雨器已被证明在减少土壤侵蚀方面非常有效。