缘何 (yuán hé) — (formal, literary) why, for what reason

Definition

A literary, written-Chinese way to ask 'why?' — equivalent in meaning to 为什么 but used in formal prose, news, and editorials, not everyday speech.

pronoun

(formal, literary) whyfor what reason

缘何？
yuán hé Gǔ shì tū rán dà diē?
Why did the stock market suddenly crash?
缘何？
Tā yuán hé xuǎn zé lí kāi zhè ge chéng shì?
Why did he choose to leave this city?
缘何？
yuán hé Huì chū xiàn zhè yàng de wèn tí?
Why would such a problem arise?