a jack for doing sth
此义指把重物顶起的起重器；表示用途时用 for + 动名词。
You'll need a jack for changing a flat tyre.
换瘪胎你需要一个千斤顶。
千斤顶；起重器
水手；海员；体力劳动者；劳工；菠萝蜜；皮甲；革制护甲；白芒果；马六甲芒果
a device used for lifting heavy objects, such as a car jack
中世纪皮革防护外套
A coarse medieval coat of defence, especially one made of leather.
起重器
A mechanical device or utensil used for lifting.
菠萝蜜
The jackfruit.
一种Mangifera caesia植物
A plant of the species Mangifera caesia.
杰奎曼诺玫瑰
A jacqueminot rose.
微不足道的数量
a small worthless amount
非工具物件
A non-tool object or thing.
男水手
a man who serves as a sailor
植物或动物
A plant or animal.
体力劳动者
someone who works with their hands; someone engaged in manual labor
The old jack told us stories about his voyages across the Pacific.
老水手给我们讲了他横渡太平洋的故事。
用法提示：此处'jack'指'水手'，用作名词单数。
AI contextual example
The jacks on the ship worked together to hoist the sails.
船上的水手们一起升起船帆。
用法提示：此处'jacks'是'jack'的复数形式，表示多个水手。
AI contextual example
Every jack knows how to tie a sailor's knot.
每个水手都知道如何打水手结。
用法提示：此处'jack'泛指任何水手，用作可数名词。
AI contextual example
此义指把重物顶起的起重器；表示用途时用 for + 动名词。
You'll need a jack for changing a flat tyre.
换瘪胎你需要一个千斤顶。
jack 在这里指“一丁点儿”，通常只用于否定句，语气随意。
He doesn't know jack about cars.
他对汽车一窍不通。
grammar · medium
易错句子It's freezing outside, so put on your jack before you leave.
正确表达It's freezing outside, so put on your jacket before you leave.
jack 作名词指千斤顶、水手、菠萝蜜等，并不表示"夹克"；夹克是 jacket。汉语"夹克"本身音译自 jacket，学生常按读音把词尾 -et 丢掉，写成 jack，注意拼写必须完整。
grammar · medium
易错句子The garage keeps three jack for changing tires.
正确表达The garage keeps three jacks for changing tires.
jack 表示"千斤顶"时是可数名词，前面有基数词 three 时必须用复数形式 jacks（词尾加 -s）。汉语名词没有单复数的形态变化，学生容易漏掉复数词尾。
汽车千斤顶
I used the car jack to lift the vehicle.
我用汽车千斤顶抬起了车辆。
插座
Plug the cable into the jack socket.
把电缆插入插座。
插头
The jack plug is broken.
插头坏了。
万事通
He is a jack of all trades.
他是个万事通。
液压千斤顶
The hydraulic jack can lift heavy loads.
液压千斤顶能举起重物。
万事通（但常指样样通样样松）
He's a jack of all trades but master of none.
他是个万事通，但样样都不精。
每个人，人人
Every man jack of them showed up for the meeting.
他们每个人都出席了会议。
你什么都不知道。
I don't know jack about fixing computers.
我对修电脑一窍不通。
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Dictionary facts from ECDICT, WIKTIONARY, WORDNET.