中国西部干旱区是干旱区研究的天然实验场。
The arid areas in west China are the natural experimental fields for arid area research.
结果表明，全新世以来，中国西部干旱区的气候变化经历了多次的相对暖干和相对冷湿交替变化，变化历程较为复杂。
The results showed that the climate changing patterns had gone through several complex cycles of "warm and dry" and "cold and moist" periods.
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