DNA evidence shows that many of the ratite lineages split well after Gondwana broke up.

DNA显示，许多平胸类鸟系在冈瓦纳大陆分裂后分化得很好。

It looks like flightlessness evolved among the ratites at least six times independently, which is very surprising.

看起平胸类鸟群无法飞行是至少独立进化六次的结果，这是非常令惊讶的。

But the DNA data fouled up this hypothesis DNA evidence shows that many of the ratite lineages split well after Gondwana broke up.

DNA 数推翻了这一假设 DNA 表明，许多平胸岩谱系在冈瓦纳大陆分裂后分裂得很好。

One of these lineages was the paleognathes, which today include ratites like ostriches and emus, as well as weird South American birds called tinamous.

这些血统之一是古颌类，今天包括鸵鸟和鸸鹋等平胸动物，以及南美洲奇怪的鸟类， 称为 tinamous。