单词	tracers
释义	tracer noun trac·​er ˈtrā-sər  1 : one that traces, tracks down, or searches out: such as a : a person who traces missing persons or property and especially goods lost in transit b : an inquiry sent out in tracing a shipment lost in transit 2 : one who traces designs, patterns, or markings 3 : a device (such as a stylus) used in tracing 4 a : ammunition containing a chemical composition to mark the flight of projectiles by a trail of smoke or light b : a substance used to trace the course of a chemical or biological process especially : label sense 1d Example Sentences The enemy fired tracers at the aircraft carrier. They injected her with a radioactive tracer and tracked it via X-rays. Recent Examples on the Web Ideally, those conversations would happen within 24 hours of the test result, so arrangements could be made for the person to isolate and so a contact tracer can alert those who were around them. Washington Post, 18 Sep. 2021 My goal is at least 20 people with an AR-15 and some tracer rounds. Terry Spencer, BostonGlobe.com, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. Emily Shapiro, ABC News, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. CBS News, 18 July 2022 My goal is at least 20 people with an AR-15 and some tracer rounds. Terry Spencer, Anchorage Daily News, 18 July 2022 But before a contact tracer could call, parents would learn from the testing company that their children’s PCR tests, typically the gold standard of COVID-19 testing, were negative, even for students with symptoms. Anjeanette Damon, ProPublica, 20 May 2022 No use of any kind of fireworks, steel tipped/core ammunition, tracer ammunition or other pyrotechnic devices, including exploding targets. Scott D. Pierce, The Salt Lake Tribune, 2 June 2022 Job description: Prepare, administer, and measure radioactive isotopes in therapeutic, diagnostic, and tracer studies using a variety of radioisotope equipment. Zachary Smith, cleveland, 29 Mar. 2022 See More Word History First Known Use 14th century, in the meaning defined at sense 1 Medical Definition tracer noun trac·​er ˈtrā-sər  : a substance used to trace the course of a process specifically : a labeled element or atom that can be traced throughout chemical or biological processes by its radioactivity or its unusual isotopic mass tracers noun plural of tracer as in trackers Synonyms & Similar Words Relevance trackers shadows detectives sherlocks private detectives investigators private investigators sleuths hawkshaws dicks tails gumshoes sleuthhounds private eyes operatives feds narcs narks shamuses plainclothesmen G-men Federals
随便看	juniper webworm juniperi juniperic acid junipers Juniperus juniperuses juniperusses Junius junk junk art junk artist junk bond junk bottle junk DNA junk e-mail junk email junk food junk jewelry junk mail junk mails junk ring junk sculpture junked junker junkerdom

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