tā / bìng / bù / shì / zìgāozìdà / zhǐshì / duì / zìjǐ / de / yánjiū / lǐngyù / chōngmǎn / xìnxīn

他并不是自高自大，只是对自己的研究领域充满信心。

He is not arrogant; he is just confident in his field of research.