1 sentence

1. 他在收拾旧物时，无意中发现了一封老情书。

   tā zài shōu​shi jiù​wù shí, wú​yì​zhōng fā​xiàn le yī fēng lǎo qíng​shū.

   While tidying up old belongings, he came across an old love letter by chance.

   Source: Dong Chinese Dictionary