/dʒæk ||; dʒæk/noun[C] 1 a piece of equipment for lifting a car, etc off the ground, for example in order to change its wheel 千斤顶；汽车起重器 ☞picture at hydraulic 见hydraulic插图
2 the card between the ten and the queen in a pack of cards （纸牌中的）杰克，J ☞Look at the note at card. 参看card的注释。
a jack of all trades a person who can do many different types of work, but who perhaps does not do them very well 什么事都能干一手却又什么也干不精的人；杂而不精的人