给她讲了一段战争年代的故事：在抗美援朝的战场上，他的战友马股长被美国飞机炸掉一条腿，当时在场的四个人，没有人懂得急救知识，若是有人会止血，马股长也不至于牺牲在战场上。
O B-Person O O O O O O B-Time I-Time O O O O O B-Location I-Location I-Location I-Location I-Location I-Location I-Location O O B-Person O O O B-Person I-Person I-Person O B-Organization I-Organization B-Thing I-Thing O O B-Metric I-Metric B-Thing O O O O O O B-Metric I-Metric B-Person O O O B-Person O O O O O O O O O O B-Person O O O O B-Person I-Person I-Person O O O O O O O B-Location I-Location I-Location O