三和弦 大三和弦(Major triads)组合准绳 =根音(Root) + 大三度(Major 3rds) + 完整五度(perfect 5ths) 小三和弦(minor triads)组合准绳 =根音(Root) + 小三度(minor 3rds) + 完整五度(perfect 5ths) 增三和弦(aug.
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Triads may be major, minor, augmented or diminished according to the quality of the thirds between the bottom and middle note, and between the middle note and the top note of the three.
根据最低音与中间音之间，中间音与最高音之间的第三音的性质，三和弦可分为大，小，增或减。
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。
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