“鱼,我所欲也,熊掌,亦我所欲也；二亦我所欲也,义,亦我所欲也；二者不可得兼,舍生而取义者也.”这

“鱼,我所欲也,熊掌,亦我所欲也；二亦我所欲也,义,亦我所欲也；二者不可得兼,舍生而取义者也.”这这段话是成语（ ）的出处.