A unit of force in the foot-pound-second system of measurement, equal to the force required to accelerate a standard one-pound mass one foot per second per second(approximately0.138 newton).是什么意思_A unit of force in the foot-pound-second system of measurement, equal to the force required to accelerate a standard one-pound mass one foot per second per second(approximately0.138 newton).在线翻译_英语_读音_用法_例句