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。
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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