一回事
一回事[yī huí shì]1.■（同一件事） one and the same (thing):We were talking about the same thing.咱俩说的是一回事。He didn't know that water and H₂O are one.他不懂水和H₂O分子式是一回事。（一方面） one thing:
一回事[yī huí shì]1.■（同一件事） one and the same (thing):We were talking about the same thing.咱俩说的是一回事。He didn't know that water and H₂O are one.他不懂水和H₂O分子式是一回事。（一方面） one thing:
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