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1. Oxford American Dictionary

   datum line

   • IPA[ˈdadəm]

   • n.
     a standard of comparison or point of reference；an assumed surface used as a reference for the measurement of heights and depths.

   • noun: datum line, plural noun: datum lines

2. • 釋義

   n.

   名詞

   • 1. a standard of comparison or point of reference the majority were living below the poverty datum line
   • ▪ an assumed surface used as a reference for the measurement of heights and depths.
   • ▪ a line to which dimensions are referred on engineering drawings, and from which measurements are calculated.