1. 单腺泡腔小而狭窄,但肺泡的腔却大而膨满
The lumen of the acinus is small and narrow but that of the alveolus is large and distended.

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2. 单腺泡腔小而狭窄,但小泡状腺的腔却大而膨满
The lumen of the acinus is small and narrow, but that of the alveolus is large and distended.

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3. 单腺泡腔小而狭窄,但小泡状腺的腔却大而膨满
The lumen of the acinus is small and narrow, but that of the alveolus is large and distended.

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