Find centralized, trusted content and collaborate around the technologies you use most.
Teams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
我需要帮助来找到以下的序言代码: 祖先(x,y)仅使用 is_a(x,y),其中 X 是 Y
与动物树问题下方所附问题相关的图像