That made some populations mobile because they had to move from place to place to find food, but of course, it made starvation a very real possibility.

那样使得部分人口开始流动,人们不得不不断地迁徙,寻找食物,当然 自然灾害也造成了饥荒

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But I think as for right now, I think it's beautiful when people age naturally

但目前我觉得，人们自然地老去也是很美的，

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But normally people complete these all just naturally throughout the course of their student career.

但是通常人们在整个学生生涯里会自然地完成这些。

伯克利的课程计划 - SpeakingMax英语口语达人