1 sentence

1. 当他意识到问题的严重性时，恐怕已经为时已晚。

   dāng tā yì​shí dào wèn​tí de yán​zhòng​xìng shí, kǒng​pà yǐ​jīng wéi​shí​yǐ​wǎn.

   By the time he realizes the gravity of the problem, it may already be too late.

   Source: Dong Chinese Dictionary