Spring fever 其实和“发烧”并没有关系。这个表达通常用来形容初春天气突然转暖，人们心里感受到的一种兴奋和躁动感。
The days are getting longer and warmer - I am definitely starting to feel spring fever.
The university library has been very empty lately. I wonder if it’s spring fever that’s keeping everyone away.
短语 be full of the joys of spring 借助万象更新的春季来描述一种充满活力的、快乐的感觉。
Sara has been full of the joys of spring all day.
I am full of the joys of spring.