既又 jì yòu
This structure connects two predicates which may be separated by a comma or a pose.It means "both...and", "not only, but also".Example:
a)他太忙了,既要学英语, 又也要打工。
->He's very busy, he has to both study english and work.
b)她既会做法国菜,又会做中国菜。
->.She knows not only doing french cooking but also chinese cooking.