welded rails

例句：

1. 1.The bridge is made of welded rails, which are strong and durable.
   这座桥是由焊接的栏杆制成的，非常坚固耐用。
2. 2. The train's wheels were welded to the rails, making it more stable.
   火车的轮子被焊接到轨道上，使火车更加稳定。
3. 3. The construction workers used welding machines to weld the rails together.
   建筑工人使用焊接机器将栏杆焊接在一起。