I know whereof I speak(= I know a lot about what I am talking about) .
我知道自己在说些什么。
1.谁的,什么的,哪个的,关于什么的
2.那个人的,那个,所...的
1.an old word meaning “of or about the thing that has been referred to”
1.2Speak to the children of Israel, saying, Appoint out for you cities of refuge, whereof I spake unto you by the hand of Moses.
2你吩咐以色列人说：你们要照着我藉摩西所晓谕你们的，为自己设立逃城。
2.And if it be a beast, whereof men bring an offering unto the LORD, all that any man given of such unto the LORD shall be holy.
所许的若是牲畜，就是人献给耶和华为供物的，凡这一类献给耶和华的，都要成为圣。
3.He made also the court, in the south side whereof were hangings of fine twisted linen, of a hundred cubits.
为向阳的一面，即南面，用捻的细麻做了帷幔，共一百肘。
4.IN WITNESS WHEREOF, the Bank has caused this Guarantee to be executed by its duly authorized representative on the date first above written.
我行派遣充分授权的代表作为证人于前述日期签署本保函。
5.Whereof the priest shall burn for a memorial of the gift, part of the corn broken small and of the oil, and all the frankincense.
司祭取出一些麦粒和油并所有的乳香来焚烧，作为献给上主的火祭，为获得记念。
6.He, who possesses a body capable of the greatest number of activities, possesses a mind whereof the greatest part is eternal.
一个拥有能力行驶最大限量行为的身体的人，都拥有一颗大部分都是永恒的心灵。
7.But if there be none of these things whereof they accuse me, no man may deliver me to them: I appeal to Caesar.
但若这些人所控告我的，都是实无其事，那麽谁也不能将我交与他们；我向凯撒上诉。
8.IN WITNESS whereof the General Manager of Lloyd's Policy Signing Office has subscribed his name on behalf of each of Us.
兹证明劳氏保险单签署办公室的总经理代表我们每个公司署名。
9.And he said, Who told thee that thou wast naked? Hast thou eaten of the tree, whereof I commanded thee that thou shouldest not eat?
耶和华说，谁告诉你赤身露体呢，莫非你吃了我吩咐你不可吃的那树上的果子吗。
10.IN WITNESS WHEREOF the undersigned *, being duly authorized by their respective Governments for that purpose, have signed the Convention.
具名于下的经各自政府正式授权的代表特签署本公约，以昭信守。