众所周知，氨基断的线性聚合物(蛋白质)在溶解于水中时，会采取复杂的三维结构。

We all know that linear polymers of amino acids (proteins) adopt complex three-dimensional structures when they are dissolved in water.

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在被处理水中添加由在水中溶胀、实质上不溶解于水的阳离子性聚合物构成的粒子，对被处理水进行膜分离处理。

Specifically, water to be processed is subjected to membrane separation after being added with particles made of a cationic polymer which swells but does not substantially dissolve in water.

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