jack
noun uk/dʒæk/ us/dʒæk/
(EQUIPMENT)
[ C ]起重器，千斤顶
a piece of equipment that can be opened slowly under a heavy object such as a car in order to raise it off the ground
You need a car jack in order to change a tyre. 给汽车换轮子得用千斤顶。
(CARD)
[ C ] (also knave)（纸牌中的）J牌，杰克
a playing card with a picture of a man on it. It has a lower value than the cards showing a king or queen
the jack of clubs 梅花杰克
(BALL)
[ C ]（草地滚木球戏或法国式滚球戏中的）靶子球
a small ball towards which other balls are rolled or thrown in the games of bowls or boules
(ELECTRICAL)
[ C ]（电）插座，插口，塞孔
a connection between two pieces of electrical equipment