solder

他正在用电烙铁将电路板上的元件焊接在一起。

He is using a soldering iron to ___solder the components on the circuit board.

在工作坊中，讲师演示了如何焊接一条断裂的项链。

During the workshop, the instructor demonstrated how to ___solder a broken necklace chain.

水管工必须焊接铜管以确保接头不漏水。

The plumber had to ___solder the copper pipes to ensure a leak-free connection.