public health insect

例句：

1. 1.The public health insect is a major threat to public health.
   公共健康昆虫是公共卫生的主要威胁。
2. 2. The public health insect is a major source of disease.
   公共健康昆虫是疾病的主要来源。
3. 3. The public health insect is a major factor in the spread of disease.
   公共健康昆虫是疾病传播的主要因素。