我国解放后第一次在沙漠地带修铁路,通车后线路常常被沙丘埋没一、二公里。中科院的专家、博士们为了寻找一种像马玲薯那样,根比枝、叶发达,且能在沙漠中成活的树种,不知奋斗了多少年。当美国从地球卫星照片上发现:中国内蒙北部沙丘带长出了片片绿荫,几乎怀疑自己的高空拍照技术出了问题,多次来华探密。可是他们得到的只 After the liberation for the first time in our country, the railway was repaired in the desert. After the railway was opened to traffic, the lines were often buried in sand dunes by one or two kilometers. Experts and PhDs from the Chinese Academy of Sciences sought to find out how many years they had struggled to find a tree species with roots and branches developed and leaves capable of surviving in the desert. When the United States found from satellite photos of the Earth that the dune belt in the northern part of Inner Mongolia of China has grown in shade, it almost doubted that its high-altitude photographing technology was a problem and had repeatedly toured China. But they got only