milk·wort /ˈmɪlkˌwɚ/
  遠志科的多年草
  Milk·wort n. Bot. A genus of plants (Polygala) of many species.  The common European Polygala vulgaris was supposed to have the power of producing a flow of milk in nurses.
  Note: ☞ The species of Campanula, or bellflower, are sometimes called milkwort, from their juice.
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  milkwort
       n : any of various plants of the genus Polygala