tube upsetting machine

例句：

1. 1. Theengineer used a tube to connect the twopieces of metal together.
   工程师使用一根管子将两块金属连接在一起。
2. 2. Thescientist discovered a new typeof tube that could conduct electricitymore efficiently.
   科学家发现了一种新型的管子，可以更有效地传导电流。
3. 3. Thetube was filled with water and sealed atboth ends.
   管子里灌满了水，两端都密封了。