jack/dʒæk/名词起重器，千斤顶You need a car jack in order to change a tyre.给汽车换轮子得用千斤顶。（纸牌中的）J牌，杰克the jack of clubs梅花杰克（草地滚木球戏或法国式滚球戏中的）靶子球想跟读，去练习
