她正在学跳舞英文可以说成 "She is learning to dance."
这句话的来源是英文动词 "to learn" 和名词 "dance" 的组合。"To learn" 是动词，意思是 "学习"，"dance" 是名词，意思是 "跳舞"。
下面是一些关于 "She is learning to dance" 的英文例句及其中文翻译：
"She's been taking dance lessons for a year now." (她已经学了一年的舞蹈课了。)
"I'm so impressed by how quickly she's learning to dance." (我真的很佩服她学跳舞的速度有多快。)
"She's really dedicated to learning to dance well." (她真的很努力学好跳舞。)