projection welding machine

例句：

1. 1.This projector is perfect for classroom use, providing clear images for students to learn from.
   这款投影仪非常适合教室使用，能提供清晰的图像供学生学习。
2. 2.The engineer used a projection welding machine to repair the damaged part of the machine.
   工程师使用一台投影焊接机来修理机器的损坏部分。
3. 3. The construction team used a projection welding machine to quickly fix the roof leak.
   施工团队使用一台投影焊接机迅速修复了屋顶的漏水问题。