分螺纹连接、法兰连接二种，顶部有大小口结构两种，大口结构有利于皮囊更换。
Of threaded connections. Flanged two kinds, the top structure of the two size mouth, big mouth structure is conducive to bladder replacement.
就在你以为自己什么都见识过了的时候，你发现有一个人穿着一件缝有iPad大小口袋的夹克。
Just when you thought you had seen it all, you spot someone wearing a jacket with a pocket stitched the size of an iPad.
中等大小的口袋比小口袋要大一些，比大口袋又小一些。
The medium size packet is bigger than the small one and smaller than the big one.
中等大小的口袋比小口袋要大一些，比大口袋又小一些。
The medium size packet is bigger than the small one and smaller than the big one.
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