velocity scan

例句：

1. 1. The new speed scanner can detect the presence of drugs in a sample within seconds.
   这款新的速度扫描仪可以在几秒钟内检测出样本中的毒品存在。
2. 2. The scientist used a velocity scan to locate the source of the radiation leak.
   科学家使用速度扫描来定位辐射泄漏的来源。
3. 3. The police department has implemented a new velocity scan system to improve security at airports.
   警方部门已经实施了一种新的速度扫描系统，以改善机场的安全。