幸虧...，要不然/不然/要不/否則... means fortunately..., otherwise.... It contrasts avoided bad outcome with actual result.
Counterfactual avoidance frame - good thing happened, bad result avoided
Causal relief tone - gratitude and hindsight judgment
Frequent in storytelling and reflection - practical discourse pattern
See examples below for varied real-world usage.
Second clause should express avoided negative scenario
- Otherwise clause is essential contrast.
幸虧 introduces fortunate factor
- Keep causality explicit.
Tone often emotional/retrospective
- Fits hindsight narratives.
Luckily you reminded me,otherwise I would have forgotten.
Luckily we left early,otherwise we would be late.
Luckily it was backed up,otherwise data would be gone.
Luckily the doctor handled it in time,otherwise consequences were severe.
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