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从D大调主音do(即D)向下推一个小三度,即为B小调的主音(B)。从D大调与B小调的音阶来看,它们都是将C和F两音升高半音,因此共用一个调号。
Pitch down from D major do (ie D) down a small three degrees, which is the B-note (B). From the D and B minor scales, they both raise the C and F two-semitones, so they share a key sign.