投书，汉语词语，读音tóu shū，意思是投交书信，指所投交的书信；谓将文书或信件投入水中；扔下书籍。
读者投书栏 letters
商品竞投书 proposal
日本投降书 the Japanese Instrument of Surrender ; Japanese Instrument of Surrender
读者投书 Letters to the Editor
投书罪 illegal complaint by anonymous letters
投标书 Form of Tender ; Tender ; bid ; book of tender
投标邀请书 Invitation to Bid ; IFB ; invitation for bids ; INVITATION TO TENDER
投标书语言 language of bid
投标书澄清 clarification of bid
投标书组成 documents comprising the bid
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