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单词 air cell
释义 air cell
noun
: a cavity or receptacle for air:
 a. : the air sac of a bird
 b. : a dilation of a trachea of an insect
 c. : a pulmonary alveolus
 d. : the space between the membranes of an egg usually at the large end that increases in size with age
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更新时间:2024/12/25 0:06:45