to lay down one's life for a noble cause or the greater good
在危急关头，他选择挺身而出，为了守护大家的共同利益，不惜捐躯殉国，他的奉献精神将永远被铭记。
At the critical moment, he chose to step forward, willing to lay down his life to protect the common interests of all; his spirit of dedication will be remembered forever.
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