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

白色针一般是镀锡，黑色针则涂上了黑漆。

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.

独立金属罐公司确实购买了美国产生钢铁，但同时也表示，进可以弥补高档镀锡钢供应缺，而高档镀锡钢正是无瑕疵平版印刷所需要原材料。

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

未镀锡铜具很危，煮酸性食物会变绿，让你生病甚至死亡。

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一个重要原因是确保铜具内部镀锡不掉。

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

但并不是所有铜具都是镀锡，这里这一个没有镀锡，因为是一个糖锅。