摘要：
https://www.ams.org/home/page https://www.aps.org/ math journal: https://www.jstor.org/journal/mathhorizons 阅读全文
摘要：
editorials: https://www.ft.com/ft-view 非常重要的英文语法： https://grammartips.homestead.com/possessivewithgerund.html sed & awk GNU manual https://www.gnu.org 阅读全文