where·of /-ˈʌv, ˈɑv/
 (ad.)什?的,關於什?的,以什?的


 Where·of adv.
 1. Of which; of whom; formerly, also, with which; -- used relatively.
    I do not find the certain numbers whereof their armies did consist.   --Sir J. Davies.
 Let it work like Borgias' wine,
 Whereof his sire, the pope, was poisoned.   --Marlowe.
    Edward's seven sons, whereof thyself art one.   --Shak.
 2. Of what; -- used interrogatively.
    Whereof was the house built?   --Johnson.

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 whereof
      adv 1: of which; "punishment for a crime whereof he was convicted"
      2: of what; "he knows whereof he speaks"