mark detection

例句：

1. 1. The scientist used a microscope todetect the presence of bacteria in the sample.
   科学家使用显微镜来检测样本中的细菌。
2. 2. Thepolice department is conducting a mark detectionoperation in the area.
   警察局正在该地区进行标记检测行动。
3. 3. The forensic team wastasked with the detection of hidden markings on the wall.
   法医团队被指派寻找墙上隐藏的标记。