conductor
noun [ C ] uk/kənˈdʌk.tər/ us/kənˈdʌk.tɚ/
(MUSIC)
B2 （合唱团、乐队等的）指挥
someone who directs the performance of musicians or a piece of music
The conductor raised his baton. 指挥举起了指挥棒。
a guest conductor 嘉宾指挥
(PUBLIC TRANSPORT)
US (UK guard)列车长
a railway official who travels on and is responsible for a train
UK（公共汽车、火车或其他交通工具上的）售票员
someone whose job is to sell tickets on a bus, train, or other public vehicle
(SUBSTANCE)
导体
a substance that allows heat or electricity to go through it
Metal is a good conductor of heat. 金属是良好的热导体。