知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 . Swift then dated fellow singer-songwriter John Mayer for a brief period starting in late 2009; he’s regarded as the inspiration for her song “Expensive John.”    Through this period, Taylor went up in opposition to two of the greatest steaming providers on earth, Spotify and Apple https://www.instagram.com/tantramantraaurvigyaan/