radioactive-tracer flowmeter

例句：

1. 1. The new radioactive tracer flowmeter is more accurate than the old one.
   新型放射性示踪流量计比旧的更准确。
2. 2. The radioactive tracer flowmeter was used to monitor the water quality in the river.
   放射性示踪流量计被用来监测河流中的水质。
3. 3. The radioactive tracer flowmeter helped us to detect the leak in the pipeline.
   放射性示踪流量计帮助我们检测到管道中的泄漏。