But the popular image of a nimble predator turning on a dime and chasing down prey with lightning speed is fiction, new computer models show.The terrifying tyrannosaur was actually a slowpoke.

• 但它作为灵巧的掠食者，闪电般的速度紧紧地追逐猎物，这一受人欢迎的形象则是虚构的，新的电脑模型现实出，那吓人的霸王龙其实是一种行动缓慢的动物。