曾经，这个国家生产了世界三分之一的锡。

At one time, the country produced a third of the world's ___tin.

他把它放在一个旧的锡盒里，藏在床下以防父母发现。

He kept it in an old ___tin box, hiding it under his bed in case his parents would discover it.

防腐蚀涂层通常含有一层锡以保护下面的钢材。

Corrosion-resistant coatings often contain a layer of ___tin to protect the underlying steel.