DICT.TW Dictionary Taiwan

 where·by /-ˈbaɪ/
 (ad.)憑什?;為何;因此

 Where·by adv.
 1. By which; -- used relatively.  “You take my life when you take the means whereby I life.”
 2. By what; how; -- used interrogatively.
    Whereby shall I know this?   --Luke i. 18.
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 whereby
      adv 1: as a result of which
      2: by or through which; "the means whereby we achieved our
         goal"