图片素材来自 [www.flaticon.com](www.flaticon.com)，作者分别是 [Freepik](http://www.freepik.com/)、[srip](https://www.flaticon.com/authors/srip)、[surang](https://www.flaticon.com/authors/surang)、[xnimrodx](https://www.flaticon.com/authors/xnimrodx)、[Vitaly Gorbachev](https://www.flaticon.com/authors/vitaly-gorbachev)、[photo3idea_studio](https://www.flaticon.com/authors/photo3idea-studio)。