单词	air sac
释义	air sac noun 1 : one of the air-filled spaces in the body of a bird connected with the air passages of the lungs 2 : alveolus sense 1b 3 : a thin-walled dilation of a trachea occurring in many insects Example Sentences Recent Examples on the Web Scientifically speaking, the older the eggs are, the more porous the shells become, creating an air sac that separates the membrane (not good). Katlyn Moncada, Better Homes & Gardens, 7 July 2022 With an electric zap, the liquid shifts forward; its body follows with the air sac acting like a tail. Rasha Aridi, Smithsonian Magazine, 22 Dec. 2021 The lizards could remain underwater for up to 18 minutes while rebreathing through the air sac. Elizabeth Gamillo, Smithsonian Magazine, 27 May 2021 American Zoologist Horned screamers have air sacs under their skin that reduce the birds’ weight and help them glide long distances through the air. National Geographic, 28 May 2020 As the air sacs are infected and damaged, this triggers the immune system, which can lead to a dangerous condition called a cytokine storm. Mark Johnson, Milwaukee Journal Sentinel, 16 May 2020 When those air sacs become clogged, the lungs stiffen up. oregonlive, 7 Apr. 2020 Ventilators not only help people breathe but also can provide pressure that holds the lungs open so the air sacs don’t collapse. Patricia Callahan, ProPublica, 30 Mar. 2020 The extra-large hyoid bones in their vocal tract house massive air sacs that amplify their bombastic voice to superlative heights; they are often regarded as the loudest of any land animal. Jessica Boddy, Popular Science, 3 Feb. 2020 See More Word History First Known Use circa 1805, in the meaning defined at sense 1 Kids Definition air sac noun : one of the small pouches in the lungs where oxygen and carbon dioxide are exchanged Medical Definition air sac noun : alveolus sense b
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