資料來源 : pyDict

于此,關於此點

資料來源 : 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.

資料來源 : WordNet®

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