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这到底是怎么回事

what exactly is going on?

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phrase Rare #28,296
what exactly is going on? 到底 adds emphasis, expressing surprise, frustration, or a desire for a clear explanation.
CH: 门怎么打不开？这到底是怎么回事？
EN: Why won’t the door open? What exactly is going on?

这到底是怎么回事

What on earth is going on?

— 釜山行 (2016)

这到底是怎么回事?

What on earth is going on?

— 一一 (2000)

这到底是怎么回事？

What on earth is going on?

— RRR：双雄起义 (2022)

你打算告诉我们…这到底是怎么回事吗？

Are you going to tell us…what’s really going on?

— 这个男人来自地球 (2007)