https://blog.wongcw.com/2023/06/02/%e9%81%8a%e6%88%b2%e6%80%a7%e5%88%a5%e6%ad%a7%e8%a6%96%e7%a0%94%e7%a9%b6%e7%94%b7%e6%80%a7npc%e5%8f%b0%e8%a9%9e%e6%98%af%e5%a5%b3%e6%80%a7npc%e7%9a%84%e5%85%a9%e5%80%8d/