名词 spring 有两个含义，一个是春季，另一个是弹簧。A spring in ones step 的字面意思是脚步里装了弹簧，但实质表达的意思是由于心情好而让人脚步愈加自信，更有朝气。
例句
Theres definitely been a spring in her step since she met Michael.
自从她遇见迈克之后，走起路来脚步都变得轻快了。
I am sure youll be walking with a spring in your step when I tell you the news.
我相信我对你说这个消息后，你一定走路的节奏都会变得轻快。
Sam has been walking around with a spring in his step ever since the manager announced his promotion1.
自从经理宣布山姆升职的消息后，山姆精神抖擞，走路节奏格外轻快。