connecting rod
noun [ C ] engineering specialized uk/kəˈnek.tɪŋ ˌrɒd/ us/kəˈnek.tɪŋ ˌrɑːd/ (informal con rod)
连杆（在引擎中起连接作用，尤指汽车曲轴和活塞之间的连杆）
a rod that joins two particular moving parts in an engine, especially one joining the piston to the crankshaft in a motor vehicle