资料来源 : pyDict

于此,关於此点

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

Hereof \Here*of"\, adv.
   Of this; concerning this; from this; hence.

         Hereof comes it that Prince Harry is valiant. --Shak.

资料来源 : WordNet®

hereof
     adv : of or concerning this; "the twigs hereof are physic"