气象要素在一年中月平均最高值与最低值之差。
年较差东部比西部的下降趋势显著。
The decreasing trends of annual temperature range are more obvious in East China than in the West.
但是年较差有很显著的减小。
There exists an obvious regional difference in trends of them in China.
随着年较差的增加，单列射线和多列射线高度均减小。
With the increase of annual temperature range, the height of both single and multiserate rays decreased.
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