"Health knowledge competition" is a term that can be used to describe a contest or competition in which participants demonstrate their knowledge about health-related topics. The term "health knowledge" refers to understanding and information about how to maintain good physical and mental health, as well as how to prevent and treat various health conditions.

There is no specific source for the term "health knowledge competition," as it can be used to describe a variety of contests or competitions that focus on health-related topics. It is possible that the term "health knowledge competition" may have originated from the concept of educational competitions, in which students or other participants demonstrate their knowledge on a specific subject.

Here are a few examples of how the term "health knowledge competition" can be used in Engpsh, along with translations in Chinese:

"Our school is hosting a health knowledge competition for students to test their understanding of nutrition, exercise, and disease prevention." (我们学校将举办一场健康知识竞赛，以测试学生对营养、锻炼和疾病预防的了解。)
"The local health department is hosting a health knowledge competition for the community to raise awareness about various health issues." (当地卫生部门将举办一场健康知识竞赛，以提高社区对各种健康问题的意识。)
"I'm planning to enter the health knowledge competition at the county fair this year to see how much I know about healthcare." (我打算今年参加县博览会的健康知识竞赛，看看我对医疗保健的了解有多少。)