戴维试图制造一个电动机，但他遇到了困难。

Davy was trying to create an electric motor, but he was stuck.

功率计显示了电动机的效率。

The dynamometer showed the efficiency of the electric motor.

电枢是电动机中的关键部件。

The armature is a crucial component in electric motors.

工程师在设计电动机时利用磁性。

Engineers use magnetism in the design of electric motors.

混合动力汽车结合了电动机和内燃机的优点。

A hybrid electric vehicle combines the advantages of an electric motor and an internal combustion engine.

这个实验展示了电动机的工作原理。

This experiment demonstrates the working principle of an electric motor.

这个电动机的扭矩非常高，适合重型工作。

This electric motor has very high torque, suitable for heavy-duty work.

这台缝纫机是靠电动机启动的。

Is driven by an electric motor.

这辆汽车是由一台电动机驱动的.

This car is driven by an electric motor.

这些机器都是由电动机驱动的.

The machines are driven by electric motors.