for what reason; why:
Wherefore dost thou (= do you) grieve?
an old word meaning ‘because of the fact that has just been referred to’
used in the past to mean “why”为什么（旧时用语）
“Wherefore art thou Romeo?” [=why are you Romeo?]
“为什么是你罗密欧？”
- Shakespeare, Romeo and Juliet (1594-95)莎士比亚，《罗密欧与朱丽叶》（1594~1595）