半音行增加了音乐中的紧张度，特别是上行的半音音阶。
Chromaticism adds tension to music and especially chromaticism that's pulling up.
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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