The paucity of the avifauna of the Eurasian highlands (only 75 species breed regularly above the timber line) is determined by severe natural conditions and scarcity of food sources.
英
美
释义
欧亚地区高地鸟类区系的贫乏性(仅有75种繁殖于林线之上)受严酷的自然条件和食物资源短缺所决定。
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