Plot Summary:The story shows the dangers of fly contamination and the spread of disease by germs in the home, and how these dangers can be overcome.
关键词:玛丽的生日英文怎么说玛丽的生日蛋糕The story shows the dangers of fly contamination and the spread of disease by germs in the home, and how these dangers can be overcome. Trivia Produced for the Ministry of Health.