| 词汇 | whereof | 
| 释义 | whereof  adverb  old use or formal uk/ˌweəˈrɒv/ us/ˌwerˈɑːv/  其,在其中 of which or what  She knows whereof she speaks (= she has direct experience or knowledge of what she is talking about). 她很清楚她说的情况是什么样。   He sees hostility, the cause whereof he does not know. 他看到了敌意,却不知道其原因。  
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