double-headed nail

例句：

1. 1.The carpenter used a double-headed nail to secure the wooden planks together.
   木匠使用双头钉将木板固定在一起。
2. 2. He applied double-headed screws to attach the shelves to the wall.
   他用双头螺丝将架子固定在墙上。
3. 3.The engineer designed a double-headed bolt for the heavy machinery to ensure it wouldn't come loose during operation.
   工程师设计了一款双头螺栓，用于重型机械，确保在运行过程中不会松动。