Epithelium also lines the air tubes and lung cavities.

上皮组织 还衬盖气管和肺腔。

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During the pupa stage, they do not eat foods but do sit at the surface and breathe air through two small tubes.

在蛹阶段，它们不吃食物，但在水面游动时会靠两个细小的管道呼吸空气。

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Air is sucked in via tubes and wafted gently over the bees.

通过导管吸入的空气轻轻地飘荡在蜜蜂周围。

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Though there is no reason to use Dr Knight's invention to replace existing optical fibres, it could, by varying the spacing of the air-filled tubes, make a handy filter allowing selected wavelengths (and the messages they carry) to enter or leave the waveguide while the others are contained.

ECONOMIST: New-age crystals

Dr Knight replaced the cladding with glass that has tubes of air running along it.

ECONOMIST: New-age crystals

This lifesaving machine is itself a threat, because bacteria can grow in the tubes that bring air to the baby's lungs.

FORBES: Special Surgery