Hello, I'm an expert in precious metals and their measurement systems. When discussing gold, one of the most common units of measurement is the troy ounce.

The troy ounce is a unit of weight that is used primarily for precious metals, such as gold and silver. It is different from the avoirdupois ounce, which is used for other goods. One troy ounce is equal to 31.1034768 grams. The troy ounce is named after the city of Troyes in France, where it was originally used in the Middle Ages.

Now, let's translate that into Chinese:

你好，我是贵重金属及其测量系统的专家。当讨论黄金时，最常用的计量单位之一是金衡盎司。

金衡盎司是一种主要用于贵金属（如黄金和白银）的重量单位。它与用于其他商品的常衡盎司不同。一金衡盎司等于31.1034768克。金衡盎司的名称来源于法国的特鲁瓦市，它在中世纪最初在那里使用。

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A troy ounce is 1/12 of a troy pound (a troy pound is actually lighter than an avoirdupois pound). The troy ounce (480 grains) is heavier than the avoirdupois ounce (437.5 grains). A grain is 64.79891 milligrams (mg); therefore one troy ounce is 31.1034768 grams (g).read more >>