单词 | tracer |
释义 | Word Frequency tracer(ˈtreɪsə) noun 1. a person or thing that traces 2. a. a projectile that can be observed when in flight by the burning of chemical substances in its base b. ammunition consisting of such projectiles c. (as modifier) tracer fire 3. medicine any radioactive isotope introduced into the body to study metabolic processes, absorption, etc, by following its progress through the body with a gamma camera or other detector 4. an investigation to trace missing cargo, mail, etc |
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