whereof

adv.

（疑问副词）关于什么，（关系副词）关于那事（人，物），以什么的；

in witness whereof以资证明；作为其证据

1. In witness whereof, I set my hand.
   我作为证人签字。
2. The books whereof the best are lost.
   其中最好的几本已经遗失的那些书。

1. He didn't know whereof he talked about.
   他不知道自己说了些什么。
2. They were the earliest poets whereof there is record
   他们是有记载的最早的诗人。

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