All four of these conditions were preceded by two minutes of mundane conversation between Ms Mayer, who filled the role of the stranger, and the dog's owner.

在每种情境开始前，梅耶女士都会充当陌生人的角色与狗的主人进行时长两分钟的常规交谈。

Ultimately there's only one person who could fill the role of Curly, and everyone else who tried to be Curly ultimately came up short.

最终只有一个人可以担任 Curly 的角色， 而其他试图成为 Curly 的人最终都失败了。

So it looks like we've got a scenario where T. rex adults filled the role of " giant predator" in Late Cretaceous North America, and their teenage offspring acted as mid-sized predators.

所以看起来我们有这样一种情况， 霸王龙成年恐龙在白垩纪晚期的北美扮演“巨型捕食者”的角色，而它们十几岁的后代则扮演中型捕食者的角色。