N-COUNT (管弦乐队或合唱团的)指挥 A conductor is a person who stands in front of an orchestra or choir and directs its performance.

N-COUNT 公交车售票员 On a bus, the conductor is the person whose job is to sell tickets to the passengers.

N-COUNT 列车员 On a train, a conductor is a person whose job is to travel on the train in order to help passengers and check tickets.

N-COUNT 导体 A conductor is a substance that heat or electricity can pass through or along.