1 sentence

1. 他在路边随口哼唱起一支旋律优美的曲子。

   tā zài lù​biān suí​kǒu hēng​chàng qǐ yī zhī xuán​lǜ yōu​měi de qǔ​zi.

   He casually hummed a beautiful melody by the side of the road.

   Source: Dong Chinese Dictionary