So to hold their food and eat it too, an even deeper gill arch evolved into a secondary set of jaws.

为了边抓住食物边吃，一块在口腔内更深处的腮弓演化成了第二组颌。

And each of these animals had gill arches.

这些动物中的每一个都有鳃弓。

Quinto, Conseil said, the lophobranchians, which have fully formed, free-moving jaws but whose gills consist of little tufts arranged in pairs along their gill arches.

第五目是总鳃鱼、康塞尔说，鳃是完全的和自由的，但由许多小刷子构成，一对一对地排在鳃环节上。