[] () any curve in the shape of the letter ‘J’, which shows sth first decrease slightly then rapidly increase to a much higher levelJ 曲线（指 J 字母形状的任何曲线，表示某种事物一开始轻微下降，然后迅速上升到一个更高的水平）ⓘ In economics, the J-curve is used to show the change in level of a country's imports compared to exports (its balance of trade) after a decrease in the value of the national currency.经济学上，J 曲线用来说明一国货币贬值后，进出口水平相比（即贸易收支，balance of trade）发生的改变。