photoelastic materials

例句：

1. 1. The new material is much stronger than the old one.
   这种新材料比旧的强得多。
2. 2. The scientist used this material to make a model of the sun.
   这位科学家用这种材料制作了太阳的模型。
3. 3. Photoelastic materials are widely used in physics experiments.
   光弹性材料在物理实验中被广泛使用。