The secondary rules are those that provide for the creation, alteration, and extinction of primary rules.
城市是一个记忆的迷宫,每一条街道,每一栋建筑,每一个角落都藏着一个等待被发现的故事。
The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.
牧场音乐不仅仅是一种流派,它是一种生活方式。
"The stories we tell ourselves are the ones that shape us."