variation between different years
variation between different years
不同年份之间的变化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Through the variation between different years, the law of variation and the spreading direction in different regions are reflected.
通过不同年度间的对比，反映出病虫害发生区域的变化及蔓延方向。
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