whereof
[weərˈʌv]
adv.
（疑问副词）关于什么，（关系副词）关于那事（人，物），以什么的;
例句:
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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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Solomon knew whereof he spoke.
所罗门知道他讲什么.
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In acknowledgement whereof I have hereunto affixed my signature.
下面是我的签名,确认我的誓言.
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A Protestant Militia of 25,000, the most whereof are expert in war.
来自W. Petty
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I would you would make use of your good wisdom, Whereof I know you are fraught.
来自King Lear,Shakespeare
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Why, there they are, both baked in this pie, Whereof their mother daintily hath fed.
来自Titus Andronicus,Shakespeare