threefold symmetry

例句：

1. 1. The structure of the crystal ischaracterized by its threefold symmetry.
   这种晶体的结构特征是其三重对称性。
2. 2. Thismodel has been shown to exhibit threefoldsymmetry in its behavior.
   这个模型已被证明在其行为中表现出三重对称性。
3. 3. Thesymmetry of the pattern is such that itcan be easily replicated with a simpleruler and compass.
   这种图案的对称性使得它可以用简单的直尺和圆规轻松复制。