symmetrical H attenuator

例句：

1. 1.The two buildings are symmetrical in design.
   这两栋建筑在设计上是对称的。
2. 2. The symmetry of the pattern is striking.
   这种图案的对称性非常引人注目。
3. 3.The symmetry of the flowers is a testament to their beauty.
   花朵的对称性是它们美丽的象征。