单词	pollen grain
释义	pollen grain noun : one of the granular microspores that occur in pollen and give rise to the male gametophyte of a seed plant Example Sentences Recent Examples on the Web Their findings indicated that the earth can often offer previews to major climate change tipping points that include ocean level rise, sediment accumulation and pollen grain fossils. Stephanie Innes, The Arizona Republic, 14 Aug. 2021 Note that both a pollen grain and a dust particle can be larger than 5 microns. Jv Chamary, Forbes, 29 May 2021 But there’s more to it than simply looking at leaves and pollen grains under a microscope. Amy Stewart, Washington Post, 26 Sep. 2019 The solution, weak enough to avoid harming the prized plant, could help dissolve the hard exteriors of pollen grains to aid fertilization. Bradley White, National Geographic, 24 Dec. 2019 Expect conditions around the US to worsen as the weeds’ 1 billion pollen grains per plant (!) percolate around the country. Natasha Frost, Quartz, 2 Sep. 2019 Traditionally scientists have used pollen grains from lakebed cores to study past plant communities. Paul Voosen, Science | AAAS, 10 Dec. 2019 Over the last three years, Lyson, Miller and their team have extracted more than 7,000 fossils from the site, including 16 species of mammals, 233 species of plant, and over 37,000 pollen grains. Cathleen O'grady, Ars Technica, 25 Oct. 2019 The team also collected more than 6,000 fossilized leaves and analyzed more than 37,000 pollen grains. New York Times, 24 Oct. 2019 See More Word History First Known Use 1835, in the meaning defined above
随便看	commemorated commemorates commemorating commemoration commemorations commemorative commemoratively commemoratives commemorator commemorators commemoratory commence commenced commencement commencements commencer commencers commences commencing commend commend itself to commenda commendable commendablenesses commendably

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