orthotropic hardening

例句：

1. 1. The material is orthotropic, which means it has properties that are different in different directions.
   这种材料是正交的，意味着它在不同方向上的性质是不同的。
2. 2. In engineering, orthotropic materials are used to make structures that can withstand stresses in multiple directions.
   在工程中，正交材料被用来制造可以承受多个方向应力的结构。
3. 3. The orthotropic nature of the material makes it ideal for use in construction, where strength and flexibility are both important.
   材料的正交性质使其非常适合用于建筑，因为强度和灵活性都很重要。