Well this right here is the operculum of a fish.

这个就是的鳃盖。

And as the operculum kind of moves like this, what it does is it draws the water over the gills.

当鳃盖这样，它会将引向鳃部。

In other words as water moves through the mouth and out the operculum, it's not enclosed because it's just sitting in water.

换句话说， 当通过嘴进入并从鳃盖流出，它并不是封闭的， 因为它只是处。

And so this musculature, or the genes that make that push in this what's called buccal breathing in a frog, genetically is the same as the movement of the operculum or that two stroke movement of the operculum.

因此，这种肌肉结构， 或者在青蛙所谓的口腔呼吸推这一作的基因，从遗传学角度来看， 与鳃盖的运或鳃盖的两步运是相同的。

Well if you think about that, once we have this operculum right here, if you close that operculum then we can have essentially the evolution of lungs coming from that.

那么，如果你考虑到这一点， 一旦我们有了这个鳃盖，如果你关闭这个鳃盖， 那么我们实际上可以看到肺从这里进化而来。