填空题 The success of health communication interventions depends on many factors，including the sustainability of a program and the development of communication tools and（）.

填空题 There are three key aspects of transactional communication：（），multiple levels of meaning，and the importanceof context and culture.

填空题 The World Health Organization defines health as“a state of complete physical，mental and（）and not merely the absence of disease or infirmity”.