一向以为,古人是很不讲环保的。譬如我们熟悉的黄河, 如今早已经成为了地上河。几百年来,黄河决堤曾给 黄河中下游的人民带来过无数的灾难。究其原由,是黄河流经黄土高原的时候,将大量的泥沙带向了中下游,日积月累形成了我们今天的局面。看起来黄土高原该是罪魁祸首了。但 It has always been thought that the ancients did not talk about environmental protection. For example, the Yellow River we are familiar with has now become a river on the ground. In the past few hundred years, the Yellow River had caused numerous disasters to the people in the middle and lower reaches of the Yellow River. The reason is that when the Yellow River was flowing through the Loess Plateau, a large amount of sediment was brought to the middle and lower reaches, and the accumulated situation of today formed a situation of today. It seems that the Loess Plateau is the culprit. but