light densimeter

例句：

1. 1. The light density of the sampleis measured by this instrument.
   通过这个仪器测量样品的光密度。
2. 2. The light density of thepaint is important for its durability.
   油漆的光密度对其耐用性很重要。
3. 3. The lightdensity of the soil canaffect the growth of plants.
   土壤的光密度会影响植物的生长。