单词	trace element
释义	trace element noun : a chemical element present in minute quantities especially : a micronutrient (such as iodine, iron, and zinc) with an optimum daily intake of typically less than 100 milligrams a day Example Sentences Recent Examples on the Web Related Stories Rossi and McNamara's team studied 10 million-year-old frog and tadpole fossils and the almost 50-million year-old fossils of a marine reptile and prehistoric bat using trace element chemistry. Daisy Hernandez, Popular Mechanics, 20 Aug. 2019 One of the richest stores of data inside a core, coral detectives are finding, is its year-by-year record of trace elements in ocean water. Quanta Magazine, 29 May 2018 One of the richest stores of data inside a core, coral detectives are finding, is its year-by-year record of trace elements in ocean water. Quanta Magazine, 29 May 2018 One of the richest stores of data inside a core, coral detectives are finding, is its year-by-year record of trace elements in ocean water. Quanta Magazine, 29 May 2018 One of the richest stores of data inside a core, coral detectives are finding, is its year-by-year record of trace elements in ocean water. Quanta Magazine, 29 May 2018 One of the richest stores of data inside a core, coral detectives are finding, is its year-by-year record of trace elements in ocean water. Quanta Magazine, 29 May 2018 Now the case is once again back in the news, thanks to Richard Ash, a geologist at the University of Maryland, College Park who specializes in analyzing trace elements in geologic samples. Jennifer Ouellette, Ars Technica, 25 Dec. 2018 For blue sapphires, traditionally the most sought-after color, the important trace elements are iron and titanium. C. Claiborne Ray, New York Times, 22 June 2018 See More Word History First Known Use 1932, in the meaning defined above Medical Definition trace element noun : a chemical element present in minute quantities especially : a micronutrient (as iodine, iron, and zinc) with an optimum daily intake of typically less than 100 milligrams
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