ceață și fum noi Martir ait sacs Admirabil Evadare din pușcărie legătură
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The New York Times on Twitter: "Human lungs are made up of millions of microscopic, balloon-shaped air sacs called alveoli, the workhorse of the respiratory system, where the exchange of gases takes
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Diagram Showing The Pulmonary Alveolus (air Sacs) In The Lung Royalty Free Cliparts, Vectors, And Stock Illustration. Image 15915102.