But extensive irrigation projects, the encroaching desert and an increasingly dry climate have caused to shrink to 5% its former size.
但是过度的灌溉，逐渐的沙漠化以及气候的变化，已经使如今乍得湖的面积仅为以前的5%。
Mountains to the north, northwest and west shield the city and northern China's agricultural heartland from the encroaching desert steppes.
北面、西北面和西面的群山将城市和华北农业中心地带环绕，阻止了沙漠草原对这些地方的侵蚀。
But the desert is encroaching on this metropolis.
但是，沙漠正侵蚀着这个大都市。
The Tengger desert is encroaching from the south-east and the Badain Jaran desert from the north-west.
腾格尔沙漠从东南方向侵入，而巴丹吉林沙漠也在从西北方向缓缓接近。
The Tengger desert is encroaching from the south-east and the Badain Jaran desert from the north-west.
腾格尔沙漠从东南方向侵入，而巴丹吉林沙漠也在从西北方向缓缓接近。
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