“我是‘刘老庄连’第6679名战士。扛起这面旗，我有勇气；成为下一个英雄，我有决心……”2025年7月，新兵董洪运面向战旗庄严宣誓。
This data structure comes from the Wikipedia page on mutual recursion, which itself cites course notes from an introduction to Standard ML by Robert Harper. I am not aware of practical reasons to choose this particular representation of trees over the alternatives, other than as an illustration of a language’s ability to support mutually recursive data. I find it unwieldy, which is why I chose to use it for this post.2
，这一点在吃瓜网中也有详细论述
Мощный удар Израиля по Ирану попал на видео09:41
США разрешили продажу погруженной на танкеры российской нефти02:54