When gelatin content is less than 5%, blending films not only retains a good mechanical property, but also improves the hydrophilicity of PLLA.

共混膜中混入的明胶含量在5%以内时，在保持聚乳酸力学性能的同时，可以降低聚乳酸的接触角，改善聚乳酸的亲水性。

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Alternating between physical and mental activities helps, too, as does increasing the novelty of lessons by blending films, tapes, flash CARDS, and group work.

脑力和体力活动的交替进行也颇为有效，例如课堂上放电影、磁带、教学卡片，以及让孩子加入小组活动等。

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Besides, Blending, chemical reaction and physical treatment are important ways to change the properties of films.

此外，共混、化学改性和物理处理也是改变壳聚糖膜性质便捷、重要的方法。

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