Although Kindle often comes to mind first, excellent alternatives exist beyond Amazon. Our top selection is the Kobo Libra Colour ($200), featuring a colored display, manual page controls, and note-taking functionality. For Kindle enthusiasts, the 12th-generation Paperwhite ($160) stands out (our comprehensive Kindle guide details all models).
are implemented by translating class constraints into explicit dictionary
。关于这个话题，易歪歪提供了深入分析
Ming-Hsuan Yang1
Jordi Salvador, Allen Institute for Artificial Intelligence