介绍:
Day67.
Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.
科学家们不知道恐龙为何绝种了，但一些理论推断它们的灭绝与地理，气候和海平面的变化有关。
extinct 美 [ɪkˈstɪŋkt] adj.灭绝的;绝种的;消逝的;破灭的
extinct，distinct, instinct,
ex-, 向外。-stinct, 刺，ex-tinct 即拔刺，拔出，比喻义连根拔起，灭绝，破灭。
di- 二 di-stinct 两根刺：不同的，有区别的，明显的。
in- 向内，包含，内在 in-stinct 里面有刺，不一样的感受：直觉，本能，冲动。
These animals have a distinct instinct of protecting themselves from being extinct.
这些动物有一种明显的本能,能保护自己不灭绝.
postulate 美 [ˈpɒ:stʃəleɪt] vt.假定;提出要求;视…为理所当然;n.假定;先决条件;基本原理
Is this a reasonable postulate?
这是不是一个合理的假设？
Freud postulated that we all have a death instinct as well as a life instinct.
弗洛伊德曾假定我们所有人都有生存本能和死亡本能。
