water-holding material

例句：

1. 1.The reservoir is designed to hold a largeamount of water for irrigation purposes.
   这个水库设计用来储存大量的水，用于灌溉目的。
2. 2. The construction of the newdam will require the use of water-holding materials.
   新大坝的建设将需要使用储水材料。
3. 3. The farmersused to rely on rainwater and groundwater as their main water sources.
   农民过去主要依赖雨水和地下水作为他们的水源。