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1. Dr.eye 譯典通

   游絲發條

   • zhuyin[ㄧㄡˊㄙㄈㄚㄊㄧㄠˊ]
   • pinyin[yousifatiao]

   • balance spring (a very fine spring, also called a hair spring, in a mechanical watch that returns the balance wheel back to a neutral position)