Taxonomy of meanings for 於是乎:  

  • NOW
    • VPadVhere and now
  • THEREUPON
    • VPadS1.postS2timethen, thereupon; at that moment
    • VPadS1.postS2thusand thus
    • VPadS1.postS2from then on
    • VPadS1.postS2generalthen at such a time
    • VPadV{PRED}.postN{SUBJ}:postSN then V-ed; N thus V-ed
    • VPadV{PRED}.postN{SUBJ}:postSfrom then onfrom then on
  • THEREFORE
    • VPadS1.postS2and therefore
    • VPadV{PRED}.postN{SUBJ}:postSN thus/therefore VERBed.
  • HERE
    • VPadV{PRED}.postN{SUBJ}:postSin the place specified in the last sentence
    • VPadVDOES IT EVER MEAN THAT???????