When it comes to fishing, he's very serious. = He's very serious about fishing.一提起钓鱼,他就来劲。The girl disported with the new doll in great glee.女孩玩新玩偶玩得来劲。It is nice to visit new places.到陌生地方去玩真来劲。The more you hurt, the better you mosh.你越是感觉到痛,就狂舞得越来劲。The book was hard to understand, but at that he enjoyed it.那本书很难懂,但他还是读得挺来劲。