主音自然音阶的第一个音阶；主音阶。
上行自然音阶为依次由低到高上升的音。
The ascending diatonic scale is the scale going up by step from lower to higher frequencies or pitches.
上行自然音阶为依次由高到低下降的音。
The descending diatonic scale is the scale going down by step from higher to lower frequencies or pitches.
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