qiān chuí bǎi liàn
after hard work and numerous revisions (idiom)
the vicissitudes of life
千
qiān
used in 鞦韆|秋千[qiu1 qian1]
锤
chuí
variant of 錘|锤[chui2]
百
bǎi
hundred
炼
liàn
variant of 鏈|链[lian4], chain