hygiene

the importance of personal hygiene.个人卫生的重要性

a food hygiene training course.食品卫生培训课程

food hygiene,食品卫生学

personal hygiene,个人卫生

oral hygiene,口腔卫生

industrial hygiene,工业卫生；劳动卫生

dental hygiene,牙齿卫生；口腔卫生学

mental hygiene,心理卫生；心理卫生学

nutrition and food hygiene,营养与食品卫生学

hygiene education,卫生教育；保健教育

hygiene factor,保健因素