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	decidedly decidedness decidednesses decider deciders decides decides (on) decides (upon) decides on decides upon deciding deciding (on) deciding (upon) deciding factor deciding on deciding upon decidua deciduae decidual decidual cell deciduary deciduas Deciduata deciduous deciduous cypress

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