And we're supposed to believe that can track one of them?

这么说我们应该相信那个玩意踪出他们？

First, they must find the arrow shaft. It will show them which tracks to follow and also who made the hit.

首先他们要找到箭，它指示出踪的方向并确定是谁猎物。

A quick survey of current diseases lets us trace out four stages in the evolution of a specialized human disease from an animal precursor.

对当前疾病的快速调查让我们踪出从动物前身到人类特殊疾病的进化的四个阶段。