tachometer /tæˈkɒmɪtə/

• 1. 

  N-COUNT A tachometer is an instrument in a car or an aeroplane which shows the speed of the engine. 转速计 [美国英语]

  例：

  The tachometer registers a rather high 3,000 rpm at 70 mph.

  转速计在时速70英里时显示每分钟高达3000转。