Zhè shì yīxìliè yǒuqù de huódòng.
This is a series of interesting activities.
Tā xiě le yīxìliè guānyú Zhōngguó wénhuà de wénzhāng.
He wrote a series of articles about Chinese culture.
Zhège xìliè de chǎnpǐn hěn shòu huānyíng.
This product series is very popular.
