coil spring

名词 coil spring:

1. a spring in the shape of a coil
   同义词：volute spring

1. A usually rectangular pad of heavy cloth filled with soft material or an arrangement of coiled springs, used as or on a bed.
   褥垫，床垫通常为长方形的棉布垫，内装柔软材料或排列好的弹簧，常用于床上
2. 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