ammunition containing a chemical composition to mark the flight of projectiles by a trail of smoke or fire
a substance, esp a labelled element or atom, used to trace the course of a chemical or biological process
somebody or something that traces
| 单词 | tracer |
| 释义 | tracernounammunition containing a chemical composition to mark the flight of projectiles by a trail of smoke or fire a substance, esp a labelled element or atom, used to trace the course of a chemical or biological process somebody or something that traces |
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