It's unclear at present what T. rex's exact sprinting speed was, but Persons believes this fleet footed dinosaur could run down all other animals in its ecosystem.
目前，关于霸王龙行进的速度问题尚没有一个确切的答案，但是，Persons却坚信，霸王龙的脚力在其生态体系中是首屈一指的。
SHIFTING consumer tastes and changing regulations have forced even the clumsiest of retail behemoths to be more fleet-footed.
随着顾客口味的改变以及业内规则变化，即便最糟糕的零售巨兽也飞速发展起来。
The teeth of these fleet-footed predators are too small to use as daggers for large kill, but the cats have strong jaws that lock around the throat of prey until the victim stops breathing.
这些敏捷的掠夺者们的牙齿在大型猎物面前就像匕首一样显得太小，但是猫科动物强壮的颚能够环锁住猎物的喉咙直至受害者停止呼吸。
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