Troy
/trɔɪ/a system of weights used for precious metals and gemstones, based on the grain, which is identical to the avoirdupois grain.金衡制
noun [专属名词]特洛伊（小亚细亚西北部的古城）；特洛伊（美国纽约州一城市）
Troy finally fell to the Greeks.
特洛伊城最终被希腊人攻陷。
24 grains = 1 pennyweight; 20 pennyweights = 1 (troy) ounce; 12 ounces = 1 (troy) pound
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