投書 [ㄊㄡˊ ㄕㄨ; tou2 shu1]
  to deliver
  to send a letter
  a letter (of complaint, opinion etc)
  to throw a book
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  投書
  とうしょ
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  letter to the editor
  letter from a reader
  contribution
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