A harmonic interval is the interval between two notes sounded simultaneously.
同时发声的两个音之间的音程为和声音程。
The harmonic combination of the two tones constituting the extremities of such an interval.
含有这样的五度音程的末端的两个音调的和声组合。
The infrared spectrum and harmonic frequency are increasing, but the interval of frequency is decreasing.
红外光谱和谐振频率是增大的，而频率间隔是不断减小的。
The infrared spectrum and harmonic frequency are increasing, but the interval of frequency is decreasing.
红外光谱和谐振频率是增大的，而频率间隔是不断减小的。
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