gold coating वाक्य

उदाहरण वाक्य

1. :The pilots of the SR-71 Blackbird and Lockheed U-2 have helmets that feature a extremely thin layer of Gold on the visor, the visor is still perfectly clear and suitable for use, and the gold coating prevents the visor from freezing and misting up as it conducts heat and warms the visor ever so slightly.