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圆号是一种中音区嘴子铜管乐器,音响柔和,悠扬。其音域包括半音间隔的43～45个音。作为圆号音列的基础是可不用变音装置吹奏出的11个自然音:
French horn is a mid-range brass beak instrument, soft sound, melodious. Its range includes 43-45 tones at semitone intervals. As the basis for the French Tone column is the natural sound can be played out without the utterance: