2 sentences

1. 你是丹东的密友吗？

   nǐ shì Dān​dōng de mì​yǒu ma?

   Are you a close friend of Danton?

   Source: OpenSubtitles

2. 她是我的多年密友。

   tā shì wǒ de duō nián mì​yǒu.

   She has been a close friend of mine for many years.

   Source: Dong Chinese Dictionary