Public health is the science of protecting and improving the health of families and communities through promotion of healthy lifestyles, research for disease and injury prevention and detection and control of infectious diseases.
公共卫生是通过提倡健康生活方式，保护和提高家庭和社区人群健康，并且研究预防和检测疾病和伤害以及控制传染性疾病的一门科学。
Overall, public health is concerned with protecting the health of entire populations.
总而言之，公共卫生主要关注如何保护整个人群的健康问题。
These populations can be as small as a local neighborhood, or as big as an entire country or region of the world.
这里指的“人群”小到当地的一个社区，大到整个国家甚至世界。
Public health professionals try to prevent problem from happening or recurring through implementing educational programs, recommending policies, administering services and conducting research, in contrast to clinical professionals like doctors and nurses, who focus primarily on treating individuals after they become sick of injured.
公卫专业人员是通过实施教育计划、制定政策、提供服务和进行调查来预防群体问题的发生，区别于重点治疗生病和受伤的个体的临床专业人员（医生和护士）。
Public health also works to limit health disparities.
公共卫生也可作用于限制健康差异。
A large part of public health is promoting healthcare equity, quality and accessibility.
绝大部分公共卫生旨在提高医疗保健的公平性、质量与可获得性。
