Chinese phrase
〜为何会发生？ 〜 wèi hé huì fā shēng
Meaning
Why did ___ happen?
When to use it
Asks for the reason an event or change happened. It is a clear, somewhat formal way to ask about a cause.
Example dialogue
老师，工业革命为何会发生？ lǎo shī gōng yè gé mìng wèi hé huì fā shēng
Why did the Industrial Revolution happen?
因为生产技术进步，市场需求也增加了。 yīn wèi shēng chǎn jì shù jìn bù shì chǎng xū qiú yě zēng jiā le
Because production technology advanced, and market demand also increased.