little by little   (TTS發音)

by degrees；gradually；step by step 漸漸地

    He learned to cook little by little. 他慢慢學會了做菜。

    He has become rich little by little. 他漸漸富裕起來了。

    John hadn't been able to quit smoking suddenly；he had to control his smoking desire little by little. 約翰不能立即把煙戒掉，他得慢慢地控制煙癮。