symmetric involution

例句：

1. 1.The symmetry of the design is what makes it so appealing.
   设计的对称性是它如此吸引人的原因。
2. 2. The process of involution is a natural one, but it can be challenging to master.
   内卷化的过程是一个自然的过程，但掌握它可能很有挑战性。
3. 3. The symmetry of the landscape has been disrupted by human activities.
   由于人类活动的影响，景观的对称性已经遭到破坏。