Desert areas短语⁶⁸⁹⁵⁶ 基本例句 干旱沙区 There are forests on the top level and desert areas down below. They provide support for several different ecosystems. 在大峡谷顶部有森林,而在下面又有沙漠,这里有好几种生态系统。 yeeyan Desert control of Hexi corridor has representative significance in desert areas of northwest China. 河西走廊的防沙治沙在我国西北沙区具有一定的代表性。 cnki