求翻译：瑞典卡罗琳医学院3日宣布，来自美国科学家布鲁斯•巴特勒(Beutler）、卢森堡科学家朱尔斯•霍夫曼(Hoffmann)和加拿大科学家拉尔夫•斯坦曼(Steinman)获得今年诺贝尔医学生理学奖。据美联社援引诺贝尔委员会的消息称，美国科学家巴特勒和卢森堡科学家霍夫曼的获奖理由是因为其在“先天性免疫系统的活性作用方面的发现”，而加拿大科学家斯坦曼则是因为他在“树状细胞及其在适应性免疫系统方面作用的发现”而得奖。是什么意思？

3, the Caroline Institute in Sweden announced that scientists from the United States Bruce • Butler (Beutler), Luxembourg • Scientists Jules Hoffmann (Hoffmann) and Canadian scientists • Ralph Steinman (Steinman) received the Nobel Medical Physiology Award. According to the Associated Press quoted t

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Sweden Caroline announced on 3rd, Faculty of medicine, from United States scientist bulusi·batele (Beutler), Luxembourg scientist zhuersi·huofuman (Hoffmann) and Canada scientist laerfu·sitanman (Steinman) for this year's Nobel Medicine Prize for Physiology. According to the associated press citing

3, the Caroline Institute in Sweden announced that scientists from the United States Bruce • Butler (Beutler), Luxembourg • Scientists Jules Hoffmann (Hoffmann) and Canadian scientists • Ralph Steinman (Steinman) received the Nobel Medical Physiology Award. According to the Associated Press quoted t