Yahoo奇摩字典 網頁搜尋

搜尋結果

1. Oxford Dictionary

   primary treatment

   • n.
     the sedimentation and removal of most suspended matter from sewage effluent

   • noun: primary treatment

2. • 釋義

   n.

   名詞

   • 1. the sedimentation and removal of most suspended matter from sewage effluent a primary treatment plant