磅
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定义
英制质量单位，恰好等于453.59237克（16常衡盎司），也用作力的单位（磅力），等于4.44822牛顿。
解释
The pound (lb) abbreviation comes from the Latin 'libra pondo' (a pound by weight). As a force unit, one pound-force is the weight of one pound mass under standard gravity (9.80665 m/s²). The US uses pounds for body weight where most countries use kilograms; 1 kg = 2.20462 lb. The pound sterling currency takes its name from a pound of silver.
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