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一种囊状的呼吸器官，见于蝎子和蜘蛛等蜘蛛类节肢动物，由象书的纸页一们平行排列着的膜状重叠物组成。
A sacculate respiratory organ found in some arachnids, such as scorpions and spiders, consisting of several parallel membranous folds arranged like the pages in a book.
甜瓜是一种大的囊状袋子，由脂肪组织构成。
The melon is kind of a large sac-like pouch, made up of fat tissue.
这些囊状物会储存更多的细菌和食物颗粒。
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