The virus can infect any type of epithelial, or surface cell, which are found throughout the digestive, reproductive, respiratory and urinary systems.

病毒可以影响任何上皮或表皮的癌症类型，不管是在消化系统、生殖系统、呼吸系统还是泌尿系统。

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Respiratory epithelia are cells varied in height. Their histological and surface structures fit for gas exchange.

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。

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Bettas have a special respiratory organ that allows them to breath air directly from the surface.

斗鱼有一个特殊的呼吸器官，使他们能够呼吸空气从表面直接。

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While the ozone layer in the upper atmosphere plays an important role in limiting harmful ultraviolet light reaching the Earth's surface, low-level ozone is a pollutant that is harmful, causing respiratory problems in animals as well as well-documented cases in humans.

BBC: Invasive plant 'increases ozone pollution'