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Chinese (Simplified) translation of “that'll be the day”

that'll be the day

something you say in order to show you think something is unlikely to happen
(表示不太相信)胡扯,哪有那样的事
"Mike says he's going to give up smoking." "That'll be the day!"
“迈克说他要戒烟了。”“别听他胡扯!”
Impossible and improbable
(Definition of that'll be the day from the Cambridge English-Chinese (Simplified) Dictionary © Cambridge University Press)

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