(1)段階的な方法で
(2)in a gradual manner; "the snake moved gradually toward its victim"
さらに詳しく
(1)適切な順序あるいは連続で
(2)in proper order or sequence; "talked to each child in turn"; "the stable became in turn a chapel and then a movie theater"
(1)シリーズにおいて
(2)次々に
(3)one after another
(4)in a series; one after another
