River system topography is not concerned with how poplar trees grow; works on geography, no matter how strong their descriptive powers, will never be able to express the mysterious caress of the waves of the Yellow River.

• 河流地貌不会关心青杨树是怎样长大的，描述性再强的地理著作也不会写到黄河浪头那种神秘的抚摸。