translation.en: And it was an old track, but for fun he turned and he began to follow it, and I tell you, I could tell by the speed at which he moved on those pad marks that this man was a Ph.D.-level tracker.
translation.zh: 留下的旧足迹 为了好玩，他转身追踪 我告诉你，从他循迹追踪的速度 我看得出来 这家伙是博士级的追踪者