fourfold axis of symmetry

例句：

1. 1. The fourfold axis of symmetry in the crystal structure is crucial for understanding its properties.
   晶体结构中的四分对称轴对于理解其性质至关重要。
2. 2.The fourfold symmetry of the crystal structure makes it difficult to predict its behavior under different conditions.
   晶体结构的四分对称性使得在各种条件下预测其行为变得困难。
3. 3. The study of fourfold symmetry has led to important advances in materials science and engineering.
   研究四分对称性在材料科学和工程领域取得了重要的进展。