它有别于商业广告，以反映社会现实、帮助改善或解决社会公共问题为己任。
It reflects the reality of society, to help or to improve or to solve the social public problems, which is the responsibility of welfare advertising.
过去在解决公共交通问题时，我们通常基于的是对环境和社会公正的考虑，而不是经济。
In the past, the case for public transport has been made on the basis of environmental and social justice considerations rather than economics.
许多国家的公共卫生专家正在讨论如何解决我们社会中普遍存在的孤独感问题。
Public health experts in many countries are debating how to address widespread loneliness in our society.
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