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出典:Wiktionary
From the Latin phrase rēs ipsa loquitur (“the thing speaks for itself”).
res ipsa loquitur
From rēs (“thing”) + ipsa (“herself”), the feminine of ipse (“himself”) because rēs is a feminine word + loquitur (“she speaks”) the third-person form of loquor (“I speak”). Literally meaning "the thing itself speaks" or "the matter itself speaks".
rēs ipsa loquitur