double tenons

例句：

1. 1. The carpenter used double tenons to secure the wooden beams.
   木匠使用双榫头来固定木梁。
2. 2. The construction of this bridge required the use of double tenons for its stability.
   这座桥梁的建设需要使用双榫头以确保其稳定性。
3. 3. The engineer designed the structure using double tenons to enhance its strength and durability.
   工程师设计结构时使用了双榫头，以增强其强度和耐久性。