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17.regretful:懊悔的,悔恨的,遗憾的,惆怅的;regrettable:使人悔恨,令人遗憾的,可愤的,不幸的,可悲的
17.regretful: regretful, regretful, regretful, embarrassed; regrettable: regretful, regrettable, indignant, unfortunately, sadly