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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