| 单词 | tracer |
| 释义 | tracer (treɪsəʳ ) Word forms: tracers 1. countable noun A tracer is a person or thing that uses special methods to find someone or something. The patient is injected with glucose that has been tagged with a radioactive tracer. An 18,000-strong army of human tracers will also help find and warn Brits at risk of infection. 2. countable noun A tracer is a bullet that leaves light or smoke behind it so you can see where it is going. Full-power weapons are needed to fire tracers at night. Tracer fire went back and forth – red lines of bullets across the night sky. |
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