之所以...是因为 emphasizes the reason - "the reason why...is because."
The reason he succeeded is because he worked hard.
More formal and emphatic than simple 因为. Result comes first, then reason.
Result comes BEFORE reason
- 之所以 + result，是因为 + reason
- Opposite of 因为...所以
More emphatic than 因为
- Stresses the reason is important
Formal/written style
- Common in essays and speeches
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