爛船都有三斤釘 (laan6 syun4 dou1 jau5 saam1 gan1 deng1) — there must be something useful in anything broken or disused (slang) in Cantonese
laanˍ₆爛syunˎ₄船douˉ¹都jauˏ₅有saamˉ¹三ganˉ¹斤dengˉ¹釘简 烂船都有三斤钉
Mandarin Pinyin: lan4 chuan2 dou1 you3 san1 jin1 ding1
Meaning of 爛船都有三斤釘
nounthere must be something useful in anything broken or disused (slang)