看到这场灾难，令人痛心不堪。

Kàndào zhè chǎng zāinàn, lìng rén tòngxīn bùkān.

Seeing this disaster is heartbreaking.

在战争中见证了太多的苦难，让人不堪回首。

Zài zhànzhēng zhōng jiànzhèngle tài duō de kǔnàn, ràng rén bùkān huíshǒu.

Witnessing too much suffering in the war is unbearable to look back on.

他一再遭受失败，让人感到不堪回首。

Tā yīzài zāoshòu shībài, ràng rén gǎndào bùkān huíshǒu.

He repeatedly suffered failures, making it unbearable to look back.