translation.en: But there's one big puzzle remaining, and this was most succinctly put to me by my primary school math teacher in Tanzania, who's a wonderful Scottish lady who I still stay in touch with.
translation.zh: 但是仍然存在一个很大的疑问。 这主要受到了我的小学老师的启发，非常简洁 当我还在坦桑尼亚的时候，她是一位非常好的苏格兰女士 至今我仍与她保持联络