2 sentences for 红尘 (hóng​chén — mortal world)

1. 他早已看破红尘，决定出家为僧。

   tā zǎo yǐ kàn​pò hóng​chén, jué​dìng chū​jiā wéi sēng.

   He has long since seen through the vanity of the world and decided to become a monk.

   Source: Dong Chinese Dictionary

2. 他决定遁入空门，从此不再过问红尘往事。

   tā jué​dìng dùn rù kōng​mén, cóng​cǐ bù zài guò​wèn hóng​chén wǎng​shì.

   He decided to enter the monastery and leave the secular world behind.

   Source: Dong Chinese Dictionary