https://blog.wongcw.com/2019/10/01/foxit-reader-v-7-0-29455-%e5%a4%9a%e8%aa%9e%e8%a8%80%e4%b8%ad%e6%96%87%e2%80%8b%e2%80%8b%e7%89%88-%e7%a6%8f%e6%98%95pdf%e9%96%b1%e8%ae%80%e5%99%a8/