一种生物的嗅迹即它的踪迹。
A creatures foil is its track .
猎犬已失去狐狸气味的踪迹，现在只有循原路返回发现嗅迹的地方重新开始。
The dogs have lost the smell of the box ; they will have to hark back to the point where they first picked it up .
嗅迹