On the aircraft carrier, the personnel at each station are wearing colorful clothing, which is very different from the dress requirements of the same color on traditional warships. The duties are different, and the colors of helmets, vests and long-sleeved shirts worn by staff members are also different. : Purple represents fuel replenishment; red represents danger and safety control; green represents take-off and landing and aircraft maintenance; blue represents transportation and air supply support; brown represents maintenance. The appearance looks as if seven colors of "rainbow" are seen on the deck. The above text is most likely to come from? ['An essay.', 'Popular science books.', 'Travels.', 'Corporate Advertising.']