smoke densitometer

例句：

1. 1.The smoke densitometer is used to measure the density of smoke in a room.
   烟雾密度计用于测量房间内烟雾的密度。
2. 2.The doctor ordered a smoke densitometer to help diagnose lung diseases.
   医生开了一个烟雾密度计，以帮助诊断肺部疾病。
3. 3.The smoke densitometer showed that the air quality in the room was poor.
   烟雾密度计显示房间里的空气质量很差。