I quickly ran over to him, and looked down at a long thin track in the mud.

我赶紧跑到他身边， 低头看着泥地上一条细长的小路。

On the ground there were long thin tracks of iron, but it was not iron; it felt smooth and cold as glass.

地上有细长的铁迹， 但不是铁。 它摸起来像玻璃一样光滑冰冷。