Meaning of shén jīng:
神经
nerve; mental state; (coll.) unhinged; nutjob
Dāng tā jǐnzhāng shí, tā de shénjīng huì fēicháng mǐngǎn.
当他紧张时,他的神经会非常敏感。
When he is nervous, his nerves become very sensitive.
Tā de shénjīng yī kè yě bùnéng fàngsōng.
他的神经一刻也不能放松。
His mental state cannot relax even for a moment.
Tā de xíngwéi kàn qǐlái yǒuxiē shénjīng.
他的行为看起来有些神经。
His behavior seems a bit unhinged.
Tā zuìjìn de xíngwéi ràng rén juéde tā yǒudiǎn shénjīng.
他最近的行为让人觉得他有点神经。
His recent behavior makes people think he's a bit of a nutjob.