Correct

一暴十寒

/ yī bào shí hán / 
Strokes

Definition

one day's sun, ten days' frost (idiom, from Mencius); fig. to work for a bit then skimp/sporadic effort/short attention span

Example

Definition

sun for one day and chill for ten days—work hard for one day and do nothing for ten; work by fits and starts/snatches

1
Yòng
用
yī
一
bào
暴
shí
十
hán
寒
de
的
fāngfǎ
方法
nǐ
你
shì
是
xué
学
bùhǎo
不好
wàiyǔ
外语
de
的
  
。

You can't learn a foreign language well by fits and starts.