2 sentences for 镇静 (zhèn​jìng)

1. 听轻音乐有助于镇静情绪。

   tīng qīng​yīn​yuè yǒu​zhù​yú zhèn​jìng qíng​xù.

   Listening to light music helps to calm the emotions.

   Source: Dong Chinese Dictionary

2. 面对手术台上的紧急情况，主治医生始终保持镇静。

   miàn​duì shǒu​shù​tái shàng de jǐn​jí qíng​kuàng, zhǔ​zhì yī​shēng shǐ​zhōng bǎo​chí zhèn​jìng.

   In the face of an emergency on the operating table, the attending physician remained calm throughout.

   Source: Dong Chinese Dictionary