translation.en: As we look at the drawing board, we see what he's working on is, in fact, a map of the journey that the pigeon has just taken, and the red line extends through all the sights.
translation.zh: 我们看到了那个画板 上面画着的其实就是 鸽子飞行的轨迹图， 红线串联起沿途的地标。