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| Russian | English |
| на фоне | on a ground (Spraying valves are denoted by red lettering on a white ground. Flood valves are identified by white lettering on a red ground. (Maritime Engineering Practice, p.261) BorisKap) |
| фон переменного тока | magnetic hum |
| фон переменного тока | alternating current hum |
| фон проникающего излучения | penetrating background radiation |