有关供水体系的问题很多人都弄不明白。
Many people don't understand the problems related to the water system.
由于上游河道污染严重，官厅水库于1997年退出北京市饮用水供水体系。
The Guanting Reservoir quit the drinkable water supply system of Beijing in 1997 due to the seriously pollution at its upper reaches.
亚特兰大的位置距离河流的上游太远，以至于它的供水体系经常遭受洪水和干旱的影响。
Its position so far upstream has left its water supply particularly vulnerableto floods and drought.
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