n.肺泡；牙槽

Around each alveolus there are capillaries, which are very small blood vessels. 在每一肺泡周圍有許多毛細(xì)管，它們是很小的血管。

The lumen of the acinus is small and narrow, but that of the alveolus is large and distended. 單腺泡腔小而狹窄，但肺泡的腔卻大而膨滿。

Bone grafting of the alveolus is an essential step in the reconstruction of the orofacial cleft deformity. 牙槽突裂骨移植是口腔頜面部裂隙畸形重建的重要步驟。