4 sentences

1. 他口中念念有词。

   tā kǒu​zhōng niàn​niàn​yǒu​cí.

   He was muttering something under his breath.

   Source: Dong Chinese Dictionary

2. 道士口中念念有词，猛地祭出了一道灵符。

   dào​shì kǒu​zhōng niàn​niàn​yǒu​cí, měng​de jì chū le yī dào líng fú.

   The Taoist priest muttered some incantations and suddenly brandished a magic charm.

   Source: Dong Chinese Dictionary

3. 看到美味的食物，他口中不禁生出许多唾来。

   kàn​dào měi​wèi de shí​wù, tā kǒu​zhōng bù​jīn shēng​chū xǔ​duō tuò lái.

   At the sight of the delicious food, his mouth began to water.

   Source: Dong Chinese Dictionary

4. 殷医生是这家医院的外科主任，他在同事和病人口中口碑极好。

   Yīn yī​shēng shì zhè jiā yī​yuàn de wài​kē zhǔ​rèn, tā zài tóng​shì hé bìng​rén kǒu​zhōng kǒu​bēi jí hǎo.

   Dr. Yin is the chief of surgery at this hospital and has an excellent reputation among both his colleagues and patients.

   Source: Dong Chinese Dictionary