Field joint coating shall be performed only when the surfaces to be coated are clean and dry, and in the absence of airborne contamination that can affect the quality of the joint coating.

只有当将要涂敷的表面清洁，干燥且无空气污染时，才可以进行补口涂敷，这些因素都可能影响补口涂层的质量。

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These microorganisms can all be part of normal skin flora; hence, direct inoculation at the time of the operation as well as airborne contamination are the most likely causes of these infections.

这些微生物都可以是正常皮肤菌群的一部分，因此，手术过程中的直接种植和空气传播的污染是这些感染的最可能的原因。

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Airborne contamination continues to cross the western states, the new data shows, and Boise has seen the highest concentrations of radioactive isotopes in rain so far.

FORBES: Radiation Detected In Drinking Water In 13 More US Cities, Cesium-137 In Vermont Milk

Two years ago, on March 14, 2011, the National Nuclear Security Administration sent flight crews to Japan to monitor airborne and ground contamination from the still developing nuclear crisis at the Fukushima-Daiichi nuclear plant.

FORBES: Drones To Be Deployed As Nuclear Fallout Detectors