plec·trum /ˈplɛktrəm/
  撥子,琴撥
  Plec·trum n.; pl. L. Plectra E. Plectrums   A small instrument of ivory, wood, metal, or quill, used in playing upon the lyre and other stringed instruments.
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  plectrum
       n : a small thin device (of metal or plastic or ivory) used to
           pluck a stringed instrument [syn: pick, plectron]