生成一段英文短文的摘要


原始文本: The World Health Organization (WHO) is a specialized agency of the United Nations responsible for international public health. The WHO Constitution, which establishes the agency's governing structure and principles, states its main objective as "the attainment by all peoples of the highest possible level of health." It is headquartered in Geneva, Switzerland, with six semi-autonomous regional offices and 150 field offices worldwide.
The World Health Organization (WHO) is a UN agency focused on global public health. Their main objective is to promote the highest level of health for all people, as stated in their constitution. The agency has its headquarters in Geneva, Switzerland and operates through six regional offices and 150 field offices worldwide.