3 sentences

1. 他陷入了苦苦的冥思之中。

   tā xiàn​rù le kǔ​kǔ de míng sī zhī​zhōng.

   He fell into deep contemplation.

   Source: Dong Chinese Dictionary

2. 冥色渐起，山林变得一片模糊。

   míng sè jiàn qǐ, shān​lín biàn de yī piàn mó​hu.

   As dusk fell, the forest became a blur.

   Source: Dong Chinese Dictionary

3. 民间传说人死后会进入冥界。

   mín​jiān chuán​shuō rén sǐ hòu huì jìn​rù míng jiè.

   Folklore says that people enter the underworld after death.

   Source: Dong Chinese Dictionary