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tracer noun

  /ˈtɹeɪsə(ɹ)/ , /ˈtɹeɪsɚ/ , [ˈtʃɹeɪsə(ɹ)] , [ˈtʃɹeɪsɚ]
  • (chemistry) A compound, element, or isotope used to track the progress or history of a natural process.
 белязан атом
  • A round of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired in the dark.
 трасиращ куршум
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