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hairspring n. 細彈簧,游絲 細彈簧,遊絲 hairspring n 1: a fine spiral spring that regulates the movement of the balance wheel in a timepiece Hairspring \Hair"spring`\ (-spr[i^]ng`), n. (Horology)
The slender recoil spring which regulates the motion of the balance in a timepiece. [1913 Webster]
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