Once destroyed, brain cells do not regenerate.

　　腦細(xì)胞一旦遭到破壞，就不能再生。

　　There is a small risk of brain damage from the procedure

　　該手術(shù)有導(dǎo)致腦損傷的輕微風(fēng)險(xiǎn)。

　　She is best known for her work on the human brain.

　　她在對(duì)人腦的研究方面最為知名。