Humans lost all of those nasopalatine ducts a long time ago.

很久以前， 人类就失去了所有这些鼻腭管。

And it’s actually connected to the mouth by small, fluid-filled ducts called nasopalatine canals.

它实际上通过称为鼻腭管的充满液体的小管道与口腔相连。