4 sentences

1. 他的嗓音低沉而富有磁性。

   tā de sǎng​yīn dī​chén ér fù​yǒu cí​xìng.

   His voice is deep and magnetic.

   Source: Dong Chinese Dictionary

2. 他用低沉的声音对我说出了那个秘密。

   tā yòng dī​chén de shēng​yīn duì wǒ shuō​chū le nà​ge mì​mì.

   He told me the secret in a low, deep voice.

   Source: Dong Chinese Dictionary

3. 灰蒙蒙的天空显得十分低沉。

   huī​mēng​mēng de tiān​kōng xiǎn​de shí​fēn dī​chén.

   The overcast sky looked very gloomy.

   Source: Dong Chinese Dictionary

4. 试验失败后，他的情绪非常低沉。

   shì​yàn shī​bài hòu, tā de qíng​xù fēi​cháng dī​chén.

   He was in very low spirits after the experiment failed.

   Source: Dong Chinese Dictionary