这是因为中纬度和高纬度地区的林木线受到积雪存留时间和厚度的强烈影响。
This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover.
第三个来源，特别是在中纬度和高纬度地区，森林和土壤中因气候变暖而加剧的有机物腐烂，现在被认为具有潜在的重大意义。
A third sources, the warming-enhanced decay of organic matter in forests and soils, especially in the middle and higher latitudes, is now being recognized as potentially significant.
使用简单的正则表达式从XML提取纬度和经度。
A simple regular expression is used to extract the latitude and longitude from the XML.
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