White pins are often covered with tin, and black ones with black paint.

白色的大头针一般锡的，黑色的大头针则涂上了黑漆。

An important part of the girls cleaning the copper is to make sure that the inside is still tinned.

让女仆们清洁这些铜具的一个重要确保铜具内部的锡不掉。

But not all of the copper is tinned, this one here is untinned because it's a sugar pan.

并不所有的铜具都锡的，这里的这一个没有锡，为它一个糖锅。

Untinned copper can be dangerous and acidic foods cooked in it can turn green and make you ill or even die.

未锡的铜具很危险，用它煮的酸性食物会变绿，让你生病甚至死亡。

ICC does buy US made steel but says imports bridge a gap in supply for high-grade tinplated steel needed for blemish-free lithographic printing.

独立金属罐头公司确实购买了美国产生的钢铁，同时也表示，进口可以弥补高档锡钢的供应缺口，而高档锡钢正无瑕疵平版印刷所需要的材料。