And then also there is a pouch in one on the other side.

口罩中间一分为二，一边有一个小袋子。

They may hold up to 4 liters of air in a pouch in their  esophagus at a time!

他们的食道中的气袋一次最多可容纳 4 升空气！

At each corral he passed, the rider leaped from his horse, pouch in hand, sprang upon the back of another horse already saddled and in waiting, and was off as bard as he could go.

每经过一个畜栏，骑士就从马上跳下来，手里拿着兜袋，跳到另一匹已经备好了鞍的马背上，用力快跑。