In order to plan effective interventions to reverse this trend, we need a better understanding of the risk factors for respiratory diseases and symptoms in early life.

• 为了探讨我国儿童呼吸系统疾病是否存在这种趋势以及为了对这种趋势采取更好的干预措施，必须对在生命早期呼吸系统疾病的危险因素进行深入的了解。