5 sentences

1. 他完全沉浸在书里。

   tā wán​quán chén​jìn zài shū lǐ.

   He was completely engrossed in the book.

   Source: Tatoeba

2. 他们沉浸在重逢的欢愉中。

   tā​men chén​jìn zài chóng​féng de huān​yú zhōng.

   They were immersed in the joy of reunion.

   Source: Dong Chinese Dictionary

3. 全校师生都沉浸在运动会胜利的喜悦中。

   quán​xiào shī​shēng dōu chén​jìn zài yùn​dòng​huì shèng​lì de xǐ​yuè zhōng.

   The entire school's teachers and students were immersed in the joy of the sports meet victory.

   Source: Dong Chinese Dictionary

4. 演出结束后，全场观众依然沉浸在美妙的音乐氛围中。

   yǎn​chū jié​shù hòu, quán chǎng guān​zhòng yī​rán chén​jìn zài měi​miào de yīn​yuè fēn​wéi zhōng.

   After the performance ended, the entire audience remained immersed in the wonderful musical atmosphere.

   Source: Dong Chinese Dictionary

5. 这些木材需要沉浸在特制的液体中以防腐。

   zhè​xiē mù​cái xū​yào chén​jìn zài tè​zhì de yè​tǐ zhōng yǐ fáng​fǔ.

   The timber needs to be soaked in a special liquid to prevent rot.

   Source: Dong Chinese Dictionary