it seems that she is familiar with the songs as she is dancing to it
问题描述：
it seems that she is familiar with the songs as she is dancing to it
如何翻译,为何后面用TO
答
It seems that she is familiar with the songs as she is dancing to it.
她似乎对这些歌曲很熟,因为她正随着音乐起舞.
dance to (music),表示随音乐的节奏而跳舞,介词to是个固定用法.