书籍可以是镜子、窗户和滑动玻璃门。
"Books can be mirrors, windows, and sliding glass doors."
"书籍是时间的容器，它们保存着过去的思想和情感，供未来的读者探索。"
The most important thing in business is to have a sustainable competitive advantage.
The past is never dead. It's not even past.