Hairspring

['heəsprɪŋ] or ['hɛrsprɪŋ]

解释:

(noun.) a fine spiral spring that regulates the movement of the balance wheel in a timepiece.

编辑:基蒂--From WordNet

解释:

(n.) The slender recoil spring which regulates the motion of the balance in a timepiece.

录入:库尔特