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Carbolic acid( or phenol ):Organic compound, simplest member of the class of phenols. A colourless liquid with a Bland, sweetish odour, it is toxic and caustic. 石炭酸：最简单的酚类有机化合物。为无色液体，芳香味温和并带甜味，而且具有强毒性和强腐蚀性。