joy 表示“令人有趣的事，乐趣”，full of the joys of spring 字面意思是“充满了春天的乐趣”，通常是用来形容人的，表示一个人心情好；非常高兴。

【例句】
Cage has been full of the joys of spring since she got her new job.
自从找到那份新工作后，凯奇一直非常高兴。

She is full of the joys of spring. She must have got a good grade.
她满心欢喜，肯定考了个好成绩。