Learner's definition of THEREOF
formal
: of the thing that has been mentioned存在其中；由此 -
The professor explained the problem and solution thereof. [=the problem and the solution of the problem]教授解释了这个问题及其解决方法。
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A will or any part thereof [=any part of a will] may be revoked by a subsequent will.后来所立的遗嘱可以撤销之前的遗嘱或其中的任何内容。
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The problem is money, or (a/the) lack thereof. [=the problem is a lack of money]问题在于钱或者说在于缺钱。