One of the sailors' hobbies (except rubbing the deck) is to polish brass doorplates. That's why they shine so well. However, half of the inscriptions can hardly be read.

水兵的爱好之一（除了跺甲板）就是擦拭铜门牌。这就是为什么看起来总是闪闪发亮的缘故。可惜的是，多半铜牌上的文字看不清楚了。

Such materials can be used in lubricating bearings, diamond tools and rubbing tools, as substitution for copper powder, bronze powder and brass powder, thus reducing the production costs considerably.

可代替一些铜粉、青铜粉和黄铜粉产品，从原料上大大降低了生产成本。