Discussion of 一口吃不成个胖子/一口吃不成個胖子 [yì kǒu chī bù chéng gè pàng zi] one can't get fat with only one mouthful, (fig.) goals cannot be achieved in an instant, significant achievement requires time, effort and persistence - Trainchinese

1 - 〈例〉单词学习尤其如此，饭要一口一口的吃，单词也是要一个一个的学，一口吃不成个胖子。 〈例〉一口吃不成个胖子，慢慢来，别着急。

1 - 〈Example〉Word learning is particularly so; like eating rice, one must take it one mouthful at a time, and similarly, words should be learned one by one; one cannot become overweight from eating a single mouthful. 〈Example〉One cannot become overweight from eating a single mouthful; take your time, do not rush.