In the field of social development, the prevention and treatment of communicable diseases or the provision of primary education are examples of services that, due to their public good nature, require public action to ensure that the service is sufficiently provided.
在社会发展领域，预防和治疗传染病或提供初级教育等服务由于具有公益物的性质，需要采取公共行动来确保这种服务得到充分提供。