Shortcode offers a way to insert content into pages or posts.
RPL == CPL (same privilege)
，这一点在heLLoword翻译官方下载中也有详细论述
下游的优势在于市场想象空间巨大，估值弹性高，一旦实现技术突破，有望获得垄断性收益。但风险远高于上下游：盈利周期极长，预计要到2030年才能实现现金流转正；技术路线失败率高，类似Meta元宇宙投入效果不佳的案例并不少见；且资本依赖性极强，一旦融资环境恶化，将直接冲击企业生存。
But more than that, they taught me how much more fun it was to learn by playing with an interactive, dynamic program instead of passively reading about concepts in a book. […]