[音频]The international Civil Aviation Organization’s spelling alphabet is also called international 1 spelling alphabet. It is widely used by pilots, air traffic controllers in the2 . In the world of aviation, spelling alphabets have no3 to phonetic transcription systems like International Phonetic Alphabet. In order to4 caused by language 5 and 6 , the ICAO 7 to the English letters, for example, Alfa for A, Bravo for B, Charlie for C. By doing so, 8 of letters can be pronounced and understood by those who 9 and receive voice message via radio or telephone. The 10of voice signals over radio links has been achieved. This is particularly important when the safety of navigation or person is essential.