balance wheel

名词 balance wheel:

1. a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat
   同义词：balance

1. A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
   游丝在手表或钟内用于调整计时器摇轮运动的细小的卷绕弹簧