yī kǒu chī bù chéng pàng zi
lit. you cannot get fat with only one mouthful (proverb)
fig. any significant achievement requires time, effort and persistence
一
yī
one
口
kǒu
mouth
吃
chī
variant of 吃[chi1]
不
bù
no; not so
成
chéng
short name for Chengdu 成都[Cheng2 du1]
胖
pàng
fat
子
zi
noun suffix, as in 椅子[yi3 zi5] "chair"