《战国策·韩三·秦大国》
美女的价钱昂贵，诸侯都买不起，后来秦王花了三千金把美女买了下来。
美人之贾贵，诸侯不能买，故秦买之三干金。
The beautiful women are expensive, and the princes can't afford them. Later, King Qin bought the beautiful women for three thousand gold.