Sacculus

例句：

1. 1. The dog's pouch was filled with toys and treats.
   狗的袋子里装满了玩具和食物。
2. 2.The scientist used a small sac to collect samples.
   科学家用一个小袋来收集样本。
3. 3.The little girl carried a big bag of groceries home from the store.
   小女孩从商店带了一大袋杂货回家。