With a view to the arid-wet index constructed by precipitation and evaporation synthetically, it may be objective to reflect the climate arid-wet evolution characteristics in northwestern area.

重点考虑降水和蒸发因素所构造的干湿指数可以更加客观地反映西北气候干湿演变特征。

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Because of the present arid climate, few people have ever seen the Tsauchab River with flowing water or a lake in Sossus Vlei.

由于现在气候干旱，几乎没有人看到过乔彻伯河下过雨，也没有人看到索瑟斯湖盆形成过真正的湖泊。

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Thanks to the semi-arid climate, the trail is scattered with well-preserved remnants of the Klondikers' passage: leather boots, bottles, tin cans, stoves and sledge runners.

由于这里气候干燥，小道上散落着的采金热时代的遗物保存完好：有皮靴，酒瓶，罐头，炉灶和雪橇等。

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Inside a three-level building there would be a vast oasis dedicated to arid climate - or "Blade Runner territory" - and beneath would be chambers with displays whose designers will include musician Peter Gabriel and children's author Philip Pullman.

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The researchers say the toolmakers at Jebel Faya may have reached the Arabian Peninsula at a time when changes in the climate were transforming it from arid desert into a grassland habitat with lakes and rivers.

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Climate change, it says, will make food even scarcer in semi-arid countries such as Sudan.

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