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.
“从近几年的历史看，麦田怪圈都与自然音阶（钢琴的白键音符）存在者联系，”她说。 “这些自然音阶出现的频率被编入了怪圈的每个分割区域，可以同钢琴演奏出这些音调。
These diatonic scale frequencies are encoded in each segment of the crop circle and can be played on the piano.
所增加的七音在主音和下属音三和弦的情况下成为大七和弦，在自然大音阶的其他音的情况下成为小七和弦。
The seventh so added will be a major seventh in the case of triads on the tonic and subdominant, and a minor seventh in the case of other degrees of the diatonic major scale.
所增加的七音在主音和下属音三和弦的情况下成为大七和弦，在自然大音阶的其他音的情况下成为小七和弦。
The seventh so added will be a major seventh in the case of triads on the tonic and subdominant, and a minor seventh in the case of other degrees of the diatonic major scale.
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