biomarker

例句：

1. 1.Biomarkers have been used to detect the presence of cancer cells in the blood.
   生物标志物已被用来检测血液中的癌细胞。
2. 2.The study found that biomarkers could be used to predict the risk of heart disease.
   研究发现，生物标志物可以用来预测心脏病的风险。
3. 3.Researchers are using biomarkers to identify the earliest signs of Alzheimer's disease.
   研究人员正在使用生物标志物来识别阿尔茨海默病的最早迹象。