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Opisometer

资料来源 : pyDict

量图器; 曲线计; 计图器

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Opisometer \Op`i*som"e*ter\, n. [Gr. ? backwards + -meter.]
   An instrument with a revolving wheel for measuring a curved
   line, as on a map.
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