求翻译：由于“三江并流”地区未受第四纪冰期大陆冰川的覆盖，加之区域内山脉为南北走向，因此这里成为欧亚大陆生物物种南来北往的主要通道和避难所，是欧亚大陆生物群落最富集的地区。这一地区占中国国土面积不到0.4%，却拥有全中国20%以上的高等植物和全中国25%的动物种数。是什么意思？

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Due to the " 3" in river and stream is not affected by the ice age 4 and discipline of the Continental Glaciers covered the area, the mountains in the north-south, so it's a biological species Eurasian continent south of the main channel and refuge, is the Eurasian biomes rich areas. This region of

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Because of "three rivers flow" areas not covered by Quaternary glaciation of the continental glaciers covered, together with the mountains in the region as North-South, so here will become a biological species in Eurasia the main channel of the same and a place of refuge, are biomes most enrichment

Because “three Jiang Bingliu” the area the quaternary ice age continentl glaciation cover, has not been added in the region the sierra is the north and south trend, therefore here becomes the main thoroughfare and the refuge shelter which the Eurasia biology species travel frequently and extensively