中生代沉积成我国西北最大的庆阳湖盆，涉及陕、甘、宁、蒙，浩瀚辽阔。
Mesozoic sediments into Northwest China's largest lake in Qingyang, involving Shaanxi, Gansu, Ningxia, Mongolia, the vast vast.
中生代沉积成我国西北最大的庆阳湖盆，涉及陕、甘、宁、蒙，浩瀚辽阔。
Mesozoic sediments into Northwest China's largest lake in Qingyang, involving Shaanxi, Gansu, Ningxia, Mongolia, the vast vast.
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