Evolution of desert is one of important aspect of Quaternary paleoclimate and paleoenvironment research.
沙漠形成演化是第四纪古气候、古环境研究的重要内容之一。
There, under a sun that never sets, they anchor tents against freezing winds, post lookouts for polar bears, and begin coaxing the secrets of evolution from a rocky polar desert.
在那个极昼之地，他们在刺骨的寒风中固定好帐篷，设置好警戒北极熊的岗哨，然后从布满岩石的极地荒原中开始慢慢探寻进化的奥秘。
Warm and dry climate, water level declined, desert land and human activity are the primary reasons of this evolution.
造成湖岸形态变化的主要原因是气候暖干化、湖水位下降、土地沙漠化和人类活动的共同影响。
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