A person who directs an orchestra, choir, or ensemble.

• The leader guiding tempo, balance, and interpretation.

指挥乐队、合唱团或其他合奏的人员。

• 负责控制速度、平衡与诠释。

A public-transport worker who checks tickets and assists passengers.

• Common on trains, trams, and some buses.

在公共交通工具上检票并协助乘客的工作人员。

• 常见于火车、电车和部分公交车。

A material or object that readily transmits electricity, heat, or sound.

• Opposite of an insulator.

能良好传导电、热或声音的材料或物体。

• 与绝缘体相对。

One who leads, guides, or directs.

• A person acting as a guide or director.

领导、引导或指挥他人的人。

• 充当向导或主管的人。

In ring theory, an ideal measuring failure of integral closure.

• Especially the conductor of an order into its integral closure.

环论中度量环与其整闭性差距的理想。

• 尤指某阶到其整闭包的导子理想。

A grooved director used to guide surgical instruments.

• For example, guiding lithotriptic forceps.

带有沟槽的导向器，用于引导外科器械。

• 例如用于引导碎石钳。