没有人准确的知道如何清洁手干燥机，并有可能，它可能被污染的空气吹入的热，到你的手中，而不是热空气清洁。
No one knows exactly how clean a hand dryer is, and there is the possibility that it might be blowing hot, contaminated air onto your hands instead of hot, clean air.
应使用清洁，干燥和压缩空气的方法将残余的喷砂物从清洁的表面去除。
Residual blast products shall be removed from the cleaned surfaces by using clean, dry, compressed air.
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。
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.
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