non-polar symmetry axis

例句：

1. 1. The symmetry of the crystal structure iscrucial for its optical properties.
   晶体结构的对称性对其光学性质至关重要。
2. 2. Thenon-polar symmetry axisis essential for understanding the molecularstructure.
   非极性对称轴对于理解分子结构至关重要。
3. 3. The symmetry axis isa critical feature in the design of opticaldevices.
   对称轴是光学设备设计中的关键特征。