arch pitch

例句：

1. 1. The arch of the bridge is so tall that it almost touches the sky.
   这座桥的拱形结构非常高，几乎触及天空。
2. 2. The pillars of the temple are made of marble.
   寺庙的柱子由大理石制成。
3. 3. The brace supports the roof of the house.
   这个支架支撑着房子的屋顶。