The results thus obtained are:1) The ultra-long waves at 500rob level show remarkable seasonal variations, whose spectra in dry years are distinctly different from those in wet years;

分析结果表明：（1） 500毫巴月平均高度场上的超长波有着明显的季节变化特征，旱涝年的波谱特征有显著差异；

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The results showed that the average disease levels were significantly different between years, while the borer level was not significantly different;

结果表明，不同年份间的平均病害级别差异显著，而玉米螟的食叶级别却不存在显著差异；

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The relative sea level will rise in tens of future years but there will be different degree in different areas.

因此，充分认识相对海平面上升将导致的危害就显得极为重要和迫切。

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The relative sea level will rise in tens of future years but there will be different degree in different areas.

因此，充分认识相对海平面上升将导致的危害就显得极为重要和迫切。

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