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是一回事

be the same thing

→ 是
phrase Rare #17,727
be the same thing Used to say that two things are essentially the same or equivalent. Often appears with 差不多、不是, or 另一回事.
CH: 喜欢一门语言是一回事，真正掌握它又是另一回事。
EN: Liking a language is one thing, but truly mastering it is another.

不喜欢他是一回事但被个笨爱尔兰人扔出窗户不同

Not liking him is one thing, but being thrown out a window by some stupid Irishman is another.

— 虎胆龙威 (1988)

差不多是一回事

It’s pretty much the same thing.

— 水瓶座 (2016)

发钱给条子们是一回事

Giving money to the cops is one thing.

— 美国黑帮 (2007)

根本不是一回事

They’re not the same thing at all.

— 为所应为 (1989)