Meaning of ér qiě:
而且
(not only ...) but also; moreover; in addition; furthermore
Tā bùdàn cōngmíng, érqiě hěn nǔlì.
她不但聪明,而且很努力。
She is not only smart but also very hardworking.
Tā hěn cōngmíng, érqiě tā yě hěn shànliáng.
他很聪明,而且他也很善良。
He is very smart, moreover, he is also very kind.
Tā hěn cōngmíng, érqiě hěn nǔlì.
他很聪明,而且很努力。
He is very smart and in addition, very hardworking.
Tā hěn cōngmíng, érqiě hěn qínfèn.
他很聪明,而且很勤奋。
He is very smart, furthermore he is very hardworking.