variation stage 变化阶段
The result showed that the grain yield fluctuation had stage variation characteristics.
森林的过量采伐导致区域气候变化，进而引起粮食产量的变化。
Thus a method is proposed for comprehensive prevention with a deeply buried stage variation cluster piles.
为此提出了采用深埋式变阶群桩进行综合防治的方法。
The Lithofacies paleogeography and the thickness variation of Maokouan Subseries and Wuchiapingian Stage in east part of South China are analyzed and some questions in dispute are discussed.
分析了华南东部茅口亚统和吴家坪阶的岩相古地理分区及厚度变化，在此基础上对几个有争论的问题进行了讨论。
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