大自然音阶 meaning in English

scale major diatonic
scale, major diatonic

Taking the notes of the major diatonic scale as roots , and using only the notes of that scale , major triads may be formed on the tonic , subdominant and dominant , that is the first , fourth and fifth degrees of the scale
把大自然音阶的音作为根音，只使用该音阶的音，大三和弦可由主音，下属音和属音构成，即该音阶的第一、第四和第五级音。
Taking the notes of the major diatonic scale as roots , and using only the notes of that scale , minor triads may be formed on the supertonic , mediant and submediant , that is the second , third and sixth degrees of the scale
把大自然音阶的音作为根音，只使用该音阶的音，小三和弦可由上主音，中音和下中音构成，即该音阶的第二、第三和第六级音。