因此，关于鸟类的起源、恐龙和早期鸟类的生物学特性等一系列未解之谜都笼罩在困惑之中。

Confusion consequently reigns over a broad spectrum of unanswered questions dealing with avian origins and the biology of dinosaurs and early birds.

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从二十世纪七十年代开始，在古生物学圈中，关于鸟类是否是就是由一种被称作兽脚亚目的双脚恐龙群组进化而来的争论一直喋喋不休。

Starting in the 1970s, a growing number of paleontologists argued that birds had evolved from a two-legged group of dinosaurs called theropods.

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它不会很大地影响到我们怎么看待鸟类来源于恐龙的大构图，但影响到一些小细节：对动物生物学很重要的小改变。

It doesn't affect much of our big picture view of how birds came from dinosaurs, but some of the minutiae: the small changes that are important to the biology of the animals.

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