大音阶 meaning in English

major scale

This interval , which occurs between the fourth and seventh degrees of the diatonic major scale , is also known as a tritone
不协和音程发生在自然大音阶的四度和七度，也被称为三全音。
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。