扁平细胞为呼吸上皮，其结构有助于气体交换。
The flat cells are respiratory epithelia, whose structure fits for gas exchange.
颅骨也包括副鼻腔，它连接着呼吸上皮细胞和大气管。
Skull also include vice nasal, it connects with respiratory epithelia cells and atmospheric tube.
呼吸上皮细胞表面凹凸不平，其组织学和表面结构有助于进行气体交换。
Respiratory epithelia are cells varied in height. Their histological and surface structures fit for gas exchange.
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