To sacrifice one's life for a righteous cause; to readily lay down one's life for justice or principle.
面对突如其来的灾难，他为了营救被困的学生，选择了轻身殉义，谱写了一曲英雄赞歌。
Faced with a sudden disaster, he chose to sacrifice his life for a righteous cause to rescue the trapped students, composing a heroic ode.
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