资料来源 : pyDict

一点一点地,逐渐地

资料来源 : WordNet®

bit by bit
     adv 1: a little bit at a time; "the research structure has
            developed piecemeal" [syn: {piecemeal}, {little by
            little}, {in stages}]
     2: in a gradual manner; "the snake moved gradually toward its
        victim" [syn: {gradually}, {step by step}]