1 sentence

1. 既然这件事和你无关，你最好置身事外。

   jì​rán zhè jiàn shì hé nǐ wú​guān, nǐ zuì​hǎo zhì​shēn​shì​wài.

   Since this has nothing to do with you, you'd better stay out of it.

   Source: Dong Chinese Dictionary