1.N-COUNT A conductor is a person who stands in front of an orchestra or choir and directs its performance. (交响乐、合唱的) 指挥
2.N-COUNT On a train, a conductor is a person whose job is to travel on the train in order to help passengers and check tickets. 列车员
3.N-COUNT On a tram or a bus, the conductor is the person whose job is to sell tickets to the passengers. (公***汽车等的) 售票员
4.N-COUNT A conductor is a substance that heat or electricity can pass through or along. (热、电的) 导体
例：
Graphite is a highly efficient conductor of electricity.
石墨是一种高效的电导体。
5.→see also semiconductor
来自柯林斯词典