求翻译：　摘要：公益广告是向公众传达某种文明道德观念，以提高他们的文明程度，获取良好的社会效益的一种广告。公益广告作为宣传的一种手段，承担着重大的责任：宣传社会公德、职业道德、家庭美德，净化社会环境，营造一个良好的社会气氛和声势。从某种意义上说，一个城市，一个地区，一个国家，公益广告的水平是这一城市、地区、国家民众文化道德水准和社会风气的重要标志。是什么意思？

　Abstract: public service announcements are communicated to the public a certain moral values of civilization, to enhance their level of civilization, gets a advertisement for good social benefits. Public service ads as a means of propaganda, bear a great responsibility: promotion social ethics, professional ethics and family virtues, purifying the social environment, create a good social atmosphere, and the momentum. In a sense, a city, region, country, non-commercial advertising is the level of culture of the city, region, country people important symbol of morality and social mores.