经过一系列的努力，官厅水库水质明显好转，于2005年开始向北京市饮用水尝试供水。
By great efforts, the water quality of Guanting Reservoir has remarkably been changed for the better and it has started trial supply of drinkable water to Beijing since 2005.
经过一系列的努力，官厅水库水质明显好转，于2005年开始向北京市饮用水尝试供水。
By great efforts, the water quality of Guanting Reservoir has remarkably been changed for the better and it has started trial supply of drinkable water to Beijing since 2005.
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