方形膜quadrangular membrane 呈斜方形,由会厌软骨的两侧和甲状软骨前角的后面向后附着于杓状软骨的前内侧缘．方形膜下端游离，称前庭韧带．
在此情况下，两种溶液产生的化学电位差才会在每个交换膜上方形成电压。
In this situation, the chemical potential difference in the two solutions generates a voltage over each membrane.
光敏印章机的基本原理是利用特殊材料的感光性，在印章表面不需要印迹的地方形成一层不能渗透的膜，从而达到印章的效果。
Photosensitive seal machine's basic principle is to use special materials, photosensitive seal surface don't need imprinting in the local form a layer of film, which can penetrate to seal the effect.
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