there·fore /ˈðærˌfor, ˈðɛr, ˌfɔr/
  (ad.)因此,所以
  There·fore conj. & adv.
  1. For that or this reason, referring to something previously stated; for that.
     I have married a wife, and therefore I can not come.   --Luke xiv. 20.
     Behold, we have forsaken all, and followed thee; what shall we have therefore?   --Matt. xix. 27.
  2. Consequently; by consequence.
     He blushes; therefore he is guilty.   --Spectator.
  Syn: -- See Then.
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  therefore
       adv 1: (used to introduce a logical conclusion) from that fact or
              reason or as a result; "therefore X must be true";
              "the eggs were fresh and hence satisfactory"; "we were
              young and thence optimistic"; "it is late and thus we
              must go"; "the witness is biased and so cannot be
              trusted" [syn: hence, thence, thus]
       2: as a consequence; "he had good reason to be grateful for the
          opportunities which they had made available to him and
          which consequently led to the good position he now held"
          [syn: consequently]