以下为句子列表：
英文: And when a particular type of alginate is dissolved in water, then exposed to positively charged calcium ions, its molecules crosslink to form a hydrogel that is 98 percent water, with a gelatinous consistency and elastic properties similar to those of na
中文: 当某一特定类型的褐藻酸盐溶于水，遇到带正电的钙离子后，它的分子会连结形成含有98%水的凝胶，其胶质密度和弹性都类似天然的细胞外间质。
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英文: This article reviews recent progress in research on the preparation, thermal properties and orientation stability of aryl polyimide based second-order NLO materials: host-guest system, maid-chain system, side-chain system and crosslink system, and points
中文: 摘要综述了近年来采用芳香聚酰亚胺为骨架的主－客体掺杂型、主链型、侧链型和交联型的二阶非线性光学聚合物材料在合成方法、耐热性和取向稳定性等方面的研究进展情况，并根据目前存在的问题，展望了今后的研究方向。
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