齿条千斤顶 chǐtiáoqiānjīndǐng rack-and-pinion jack Origin Definitions Defs Strokes Stroke Words Sentences Sents 齿条 齒條 chǐtiáo rack a bar with teeth that meshes with a gear or pinion to convert rotation into linear motion; spline千斤顶 千斤頂 qiānjīndǐng jack a tool used to lift heavy weights, typically using a screw, rack, or hydraulic system, often used for machine repair or installation