| 单词 | air sac |
| 释义 | air sac (once / 161909 pages) n WORD FAMILY air sac: air sacs USAGE EXAMPLESPneumonia can develop when a respiratory infection spreads to the lungs, causing the lungs’ air sacs to fill with pus. Time(Nov 10, 2016) Like all sauropods, Savannasaurus had hollow bones and air sacs throughout its body, an evolutionary attempt to lighten its enormous skeleton. National Geographic(Oct 20, 2016) The illness is considered common, and is caused by a wide variety of bacterias or viruses that can inflame air sacs in a person’s lungs. Time(Sep 12, 2016) 1n a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways Syn|Hyper air cell, alveolus sac a structure resembling a bag in an animal 2n any of the membranous air-filled extensions of the lungs of birds Hyper sac a structure resembling a bag in an animal 3n any of the thin-walled extensions of the tracheae of insects Hyper sac a structure resembling a bag in an animal |
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