永定河流域是一个相对完整的生态系统。它有它自身的运行规律。而人们一旦改变了它的运行规律,随之而来的便是对人们进行惩罚性的报复,并造成灾难性的后果。“天下第一泉”——玉泉和北京西山众多泉流的干涸,又一次证明了这一点。玉泉断流北京西部的太行山脉,被称为“神京右臂”。它自西南逶迤而来,至南口与燕山山脉相会,形成一个呈弧形的山弯,状若围屏,即“北京湾”。“西山”乃京西诸山的总名。由 Yongding River Basin is a relatively complete ecosystem. It has its own laws of operation. And once people have changed its laws of operation, what follows is a punitive retaliation against people and catastrophic consequences. “First Spring in the World” - Once again, Yuquan and the drying up of many streams in the Western Hills of Beijing prove once again. Yuquan cut off the western Taihang Mountains in Beijing, known as “God Beijing right arm ”. It came from the southwestern wandering to the south exit and meet with the Yanshan Mountains, forming a curved mountain bend, if the surrounding screen, that is “Beijing Bay ”. “Western Hills ” is the name of the mountains in western Beijing. by