main water supplying strata的用法和樣例：
例句
- Underground water is the main water supply in Suihua Area.
地下水是綏化地區的主要供水水源。 - Due to the rapid socio-economic development in recent years, the water supply of the Shimen reservoir gradually evolved from the agriculture to the public and irrigation.
近年來社會經濟發展快速，石門水庫原設計主要供水標的為農業用水，演變成公共給水及灌溉並重。
