The bladder is lined with small pouches that allow it to stretch as it fills. 膀胱兩側布滿(mǎn)小囊，使得膀胱可以充盈伸展。
By comparison, during the gastric bypass procedure the surgeon diides the stomach and reshapes it into a small pouch. 比較看，在胃腸道旁路術(shù)中，外科醫師切斷胃，重新塑形為小囊。
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