伤口撒盐为了消毒更为疼痛
[shāng kŏu sā yán wéi le xiāo dú gèng wéi téng tòng]
Translating as 'Putting salt on a wound for disinfection only intensifies the pain,' this conveys deep suffering and sarcasm. It metaphorically refers to situations where efforts meant to heal cause additional distress.