Pronghorn, dependent on distance vision and speed to keep safe from predators, traverse high, open shoulders of land, where they can see and run.
叉角羚依靠远距离视觉和速度来躲避捕食者，它们在开阔的高地上穿行，在那里它们能看见东西并追逐它们。
These X-ray pulses take 300 years to traverse the distance between the central black hole and a large cloud known as Sagittarius B2, so the cloud responds to events that occurred 300 years earlier.
这些X射线脉冲花了300年从中心黑洞到达了一片巨大的云团人马座B2，于是云团对300年前的事件作出反应。
An. optimum specific concentration of abrasive by weight, traverse speed and target distance will get the highest volume removal rate while keeping up other parameters unchanged.
在其它参数不变时为获得最大的冲蚀体积率则有一最佳的磨料重量比浓度和横移速度及靶距；
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