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proof[proof 词源字典]

proof: [13] Proof and prove are of course closely related. Both go back ultimately to Latin probāre ‘test, prove’. From this in post-classical times was derived the noun proba ‘proof’, which passed into English via Old French preve as pref. In the 14th and 15th centuries this gradually changed in the mainstream language to proof, due to the influence of the verb prove.
=> probe, prove[proof etymology, proof origin, 英语词源]