2 sentences

1. 冤家路窄，没想到在这里遇见了他。

   yuān​jiā​lù​zhǎi, méi xiǎng​dào zài zhè​lǐ yù​jiàn le tā.

   It's a small world; I didn't expect to run into him here.

   Source: Dong Chinese Dictionary

2. 所谓冤家路窄，他竟然在街上碰到了仇人。

   suǒ​wèi yuān​jiā​lù​zhǎi, tā jìng​rán zài jiē​shang pèng​dào le chóu​rén.

   As the saying goes, it's a small world for enemies; he actually ran into his foe on the street.

   Source: Dong Chinese Dictionary