concrete arch

例句：

1. 1. The architect designed a concrete arch to connect the two buildings.
   建筑师设计了一个混凝土拱门来连接两座建筑。
2. 2.The arch was made of reinforced concrete and weighed over 100 tons.
   这个拱门是用钢筋混凝土制成的，重量超过100吨。
3. 3.The arch is an architectural masterpiece that has been standing for centuries.
   这座拱门是一座建筑杰作，已经矗立了数百年。