One of these, dubbed the arboreal model, holds that it developed in a tree-dwelling ancestor that was built for gliding but started flapping to extend its air time.
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释义
一个浑名树栖模型,大意如下:鸟类祖先原来是树栖动物,本来就会滑翔,后来为了延长在空中停留的时间,才开始以翅膀上下拍扑。
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