lin·ear·ly /ˈlɪnɪɝlɪ/ 副詞
  adv.(直)線地,線性地
  linearly
  線性
  Lin·e·ar·ly, adv. In a linear manner; with lines.
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  linearly
       adv 1: in a linear manner; "linearly polarized radiation" [ant: geometrically]
       2: in a linear fashion; "it grew linearly" [ant: geometrically]