英译汉：
生态屏障
ecological shield
For the past six decades, the local residents have closed factories and mines to protect the Miyun reservoir, making significant contributions to improving the environment of the country's capital. The lives of the local residents are getting better and better with the advantages of the good environment given full play.
Protecting the environment will benefit generations to come. Beijing's over 10,000-square-km mountain area is an important ecological shield and a protection zone for water sources. Originally built for flood prevention and control, the reservoir is now an invaluable asset as Beijing's important source of drinking water, as well as a strategic reserve base for water resources.
60年来，当地居民为了保护密云水库，关工厂，关矿山，为改善首都生态环境做出了重要贡献。当地居民充分发挥好山好水的优势，日子越过越红火。
保护生态环境功在当代，利在千秋。北京一万多平方公里的山区是重要的生态屏障和水源保护地。当年修建密云水库旨在防洪防涝，如今它作为北京重要的地表饮用水源地、水资源战略储备基地，已成为无价之宝。
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