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PBS地球-动物趣闻

It's the opening of a tube, called the spiracular tract, that's used to bring water in toward the gills.

这是一根管子开口, 称为,用于将带入中。

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PBS地球-动物趣闻

In Eusthenopteron, the spiracular tract opens up near the front of the skull, just like in most water-breathing fish with gills.

在 Eusthenopteron 中, 在头骨前部附近打开,就像大多数带肺鱼一样。

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PBS地球-动物趣闻

And by the time the Devonian Period had ended and the Carboniferous was underway, they had also lost their spiracular tracts, and started using a totally different kind of skull-hole for breathing, called nostrils.

到泥盆纪结束和石炭纪开始时,他们也失去了,并开始使用一种完全不同颅骨来呼吸,称为鼻

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Archaeozoic, archaeus, Archaian, archaic, archaise, archaism, archaist, archaistic, archaization, archaize,

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3G, 401(K), a,
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