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PBS地球-

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

这是子的开口, 称为孔道,用于将水带入鳃中。

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PBS地球-

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, 孔在头骨前部附近打开,就像大多数带鳃的水肺鱼样。

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PBS地球-

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,他们也失去了孔,并开始使用种完全不同的颅骨孔来呼吸,称为鼻孔。

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