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the why and wherefore
the underlying cause
the true nature
He could not explain why it was so.
I am not going to go further I am not going to try to explain why.

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Open the tool →所以然 (suó yǐ rán) means “the reason why, the why and wherefore, the underlying cause, the true nature”.
所以然 is pronounced suó yǐ rán in Mandarin Chinese.
“the reason why” is 所以然 (suó yǐ rán) in Chinese.
This page has 2 example sentences using 所以然, each with pinyin and an English translation.