polydextran gel

例句：

1. 1. This polysaccharide gel is used to treat skin conditions such as acne and eczema.
   这种聚糖凝胶用于治疗痤疮和湿疹等皮肤疾病。
2. 2. The colloid gel helps to soothe inflamed skin and reduce pain.
   这种胶体凝胶有助于舒缓发炎的皮肤并减轻疼痛。
3. 3. Hydrogels are widely used in medicine due to their ability to absorb large amounts of water.
   由于其吸收大量水分的能力，水凝胶在医学上得到了广泛应用。