浓度下降 meaning in English

density loss

Human tests showed reduced blood sugar levels .
在人体上的试验显示血糖浓度下降。
Effect of humankind health on stratospheric ozone depletion
大气平流层臭氧浓度下降对人体健康的影响
The results indicate that with increasing the thickness of fes2 thin films , the electrical conductivity , the carrier concentration and the absorption coefficient decrease
结果表明，随着薄膜厚度的增加， fes2的电阻率升高，载流子浓度下降，在高吸收区fes2薄膜的光吸收系数也呈下降趋势。
4 : photosynthetic characters : the pn , gs and transpiration rate both in control and in the transgenic seedling increased during the growth , and the ci decreased , but the change scope in transgenic seedling is more great than in control
对照的净光合速率、蒸腾速率、气孔导度后期比前期略有上升，但均低于转基因苗，山东师范大学硕士研究生学位论文其细胞间隙coz浓度下降。