常衡（アヴォワデュポア）
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定義
日常品に使用される16オンス＝1ポンドに基づく標準的な重量体系。
解説
The word comes from Old French 'aveir de peis' (goods of weight). This is the 'regular' pound (453.592 g) used in the US and UK for general purposes.
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