The oviduct ampulla and isthmus were composed of mucous layer, tunica muscularis and adventitia.

壶腹部和峡部均由黏膜层、肌层和外膜构成。

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The stomach has a relatively large epithelial surface, but because it has a thick mucous layer and the time that the drug remains there is usually relatively short, absorption is limited.

胃具有相对大的上皮表面，但由于它有较厚的粘液层，而且药物在胃内停留的时间相对较短，吸收也较少。

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Thee stomach has a relatively large epithelial surface, but because it has a thick mucous layer and the time that the drug remains there is usually relatively short, absorption is limited.

胃具有相对大的上皮表面，但由于它有较厚的粘液层，而且药物在胃内停留的时间相对较短，吸收也较少。

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When the researchers wiped the mucous layer off and returned the fish to the anemones, they were stung straight away.

BBC: Sting relief for summer swimmers

Clownfish live happily amongst the tentacles of poisonous stinging sea anemones, a relative of the jellyfish, thanks to a protective layer of mucous.

BBC: Sting relief for summer swimmers