unhealthy condition of plants

例句：

1. 1. The air pollutionis a serious threat to the health ofthe people.
   空气污染对人们的健康构成了严重威胁。
2. 2. He has developed an unhealthy condition afteryears of smoking.
   他因长期吸烟而患上了不健康的状况。
3. 3. Thedoctor advised her to takecare of her health and avoidunhealthy conditions.
   医生建议她要注意自己的健康，避免不健康的状况。