The Megalodon's relatively primitive brain is too slow to react to the new threat.

巨齿鲨相对较原始的大脑对这种新的威胁反应太慢。

The reduction in negative affect that we observed after psilocybin administration was accompanied by a reduction, one week after psilocybin, in the response of a primitive brain region called the amygdala to emotional stimuli.

我们在裸盖菇素给药后观察到的负面影响减少伴随着裸盖菇素给药一周后称为杏仁核的原始大脑区域对情绪刺激的反应减少。

It's sort of like a second brain help control the back half of the body. It's called the sacro-lumbar expansion, a bundle of nerves which acts like a primitive brain controlling the movements of the legs and tail.

就像第二个大脑来控制后半部分身体，这叫做腰底扩张，一组神经发挥简易大脑的作用，控制着后腿和尾部的活动。

In his primitive brain revolved various fiendish plans for a revenge that he would not have the courage to put into effect when the test came and he stood face to face with one of the dominant race.

在他原始的大脑中盘旋着各种恶魔般的复仇计划，当考验来临时，他与一个统治种族面对面时，他没有勇气付诸实施。