chase after the girls：泡妞
例句
He ran after the girl for about2 years but failed to win her hand.
他追求那位姑娘约有两年时间，但还是没能赢得她的爱情。
chase after
跑去赶上, 追赶
例句
He never ceased to chase after his dream in his vigorous youth.
在精力充沛的年轻时代他从未停止过追求自己的梦想。
The policeman chased after the burglar but could not catch him.
警察追赶那个窃贼，但是没有逮着他。