3 sentences

1. 药物会引起中枢神经系统兴奋。

   yào​wù huì yǐn​qǐ zhōng​shū shén​jīng xì​tǒng xīng​fèn.

   The drug causes central nervous system stimulation.

   Source: Dong Chinese Dictionary

2. 咖啡因是一种中枢神经系统兴奋剂。

   kā​fēi​yīn shì yī zhǒng zhōng​shū shén​jīng xì​tǒng xīng​fèn​jì.

   Caffeine is a central nervous system stimulant.

   Source: Dong Chinese Dictionary

3. 脊髓是中枢神经系统的重要组成部分。

   jǐ​suǐ shì zhōng​shū shén​jīng xì​tǒng de zhòng​yào zǔ​chéng bù​fen.

   The spinal cord is an important component of the central nervous system.

   Source: Dong Chinese Dictionary