a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains.是什么意思_a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句