Suddenly, a scholar who had worked in the Cannon Factory stood up and said, "Your Majesty, the cans can actually be made of tin-plated iron, and the seal can be coated with a layer of tin."
Tin-plated iron is tinplate.
In Europe, tinplate appeared in the 14th century. During the First World War, it was widely used to make military cans. However, China was unable to produce tinplate until the War of Resistance Against Japan, and even the name tinplate originated from the transliteration of Macao, because canned food was originally produced from
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