肺表面的毛细血管网为单层，网状隔膜和次级隔膜上的毛细血管网为多层；
The mesh of capillaries on the lung surface and internal wall were anatomized into a single and stratified layer of dense mesh respectively.
肺表面的毛细血管网为单层，网状隔膜和次级隔膜上的毛细血管网为多层；
The mesh of capillaries on the lung surface and internal wall were anatomized into a single and stratified layer of dense mesh respectively.
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