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English definition of “have to be seen to be believed”

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have to be seen to be believed

to be so extreme that it is difficult to believe: The mess the burglars left behind had to be seen to be believed.
Translations of “have to be seen to be believed”
in Chinese (Traditional) 若非親眼所見,否則真難以置信…
in Chinese (Simplified) 非亲眼所见真难以置信…
(Definition of have to be seen to be believed from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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