3 sentences

1. 他嘴角露出一丝微笑。

   tā zuǐ​jiǎo lù​chū yī sī wēi​xiào.

   A slight smile appeared at the corners of his mouth.

   Source: Dong Chinese Dictionary

2. 一阵幸福的微笑在她的嘴角边荡漾。

   yī zhèn xìng​fú de wēi​xiào zài tā de zuǐ​jiǎo biān dàng​yàng.

   A happy smile played around the corners of her mouth.

   Source: Dong Chinese Dictionary

3. 听到这个好消息，她的嘴角露出了微微的笑容。

   tīng​dào zhè​ge hǎo xiāo​xi, tā de zuǐ​jiǎo lù​chū le wēi​wēi de xiào​róng.

   A slight smile appeared on her lips when she heard the good news.

   Source: Dong Chinese Dictionary