他用锡合金把两块金属板焊接在一起。

He used a tin alloy to ___solder the two metal plates together.

他们共同努力，修复了这段友谊的裂痕。

They worked together to ___solder the cracks in their friendship.

这种电子元件需要用锡合金焊料连接。

This electronic component requires ___solder made of tin alloy.