Monitoring of CD4 cell levels - an indicator of the health of a patient's immune system - is also used when laboratory testing is available.
当可以获得实验室检测的时候，也可以使用监测CD 4细胞水平的方法。CD 4细胞水平是患者免疫系统健康程度的一个指标。
Biological marker, as an indicator for the change induced by the reaction of biological system and environmental factor, has been applied on environmental monitoring and risk assessment.
生物标志物作为一种反映生物体系与环境相互作用所引起的变化的指示，已越来越广泛的应用于环境检测和风险评估中。
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