Wall 'could stop desert spread' 墙壁“可阻止沙漠蔓延”

A plan to build a 6,000km-long wall across the Sahara Desert to stop the spread of the desert has been outlined.

一项计划在撒哈拉沙漠建立一条6000公里长的墙来组织沙漠蔓延的方案已经被提出。

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