reversaln.翻转；倒转；反转reversal emulsion反转乳剂,反转型乳胶reversal loudness响度逆转reversal strategy反转策略reversal reaction逆转反应, 回响反应, 反向反应reversal of debit借记撤消reversal of diode二极管反接reversal technique逆向技术reversal developer反转显影剂reversal mechanism反向机构reversal of season季节转换