Correct

千锤百炼

/ qiān chuí bǎi liàn /
Strokes

Definition

after hard work and numerous revisions (idiom)/the vicissitudes of life

Example

Definition

be thoroughly tempered; be well-seasoned; be steeled over and over again; be tried and tested

1
Zhèxiē
这些
lǎogàn
老干部
dōu
shì
jīngguò
经过
qiānchuíbǎiliàn
千锤百炼
de
  
,
men
他们
shì
dǎng
de
bǎoguì
宝贵
cái
财富
  

These veteran cadres who have all gone through fiery trials are valuable assets of the Party.

2
Jīngguò
经过
qiānchuíbǎiliàn
千锤百炼

go through fire and water

Definition

(of literary works) be polished again and again; be highly finished after repeated revisions; be revised and rewritten many times; be honed and polished