up hill welding

例句：

1. 1. The welding process is essential for the construction of bridges and other structures.
   焊接过程对于桥梁和其他结构的建设至关重要。
2. 2. Uphill welding can be challenging, but with practice, it becomes easier.
   上坡焊接可能具有挑战性，但通过练习，它变得更加容易。
3. 3. The welder used a special tool to ensure a strong connection on the uphill side.
   焊工使用一种特殊的工具，确保在上坡一侧牢固连接。