At low magnification, the outline of the comblike alveolar cavities, the alveolar sacs, the alveolar ducts, the respiratory bronchioles and the terminal bronchioles were described.

• 在低倍镜下,可以辨认出由微血管网组成的外观上呈蜂窝状的肺泡腔、肺泡囊、肺泡管、呼吸性细支气管和终末细支气管等结构的轮廓。