Definition
这是一个固定成语（固定表达），字面意思是“不能承受回头看”，实际指过去的事情太痛苦或太悲惨，让人不忍心回忆。常用来描述战争、灾难、失败等令人伤感的经历。使用时多作谓语或定语，语气正式而沉重。
f.e.
can't bear to look backtoo painful to recall
Examples
- ，不堪回首。Huíyì qǐ nà duàn zhànzhēng niándài, zhēn shì bú.Recalling those war years, it's truly unbearable to look back.
- 不堪回首。Nà duàn tòngkǔ de jīnglì ràng rén bú.That painful experience is too bitter to recall.
- ，不堪回首。Měi dāng tí dào guòqù, tā dōu huì yáotóu shuō bú.Whenever the past comes up, he shakes his head and says it's too painful to recall.
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