Something might be short at one point and become tall at another point, ugly at one point and become beautiful-- like the ugly duckling.

一个事物可能在某一时刻很矮,然后在另一时刻又会变高,某一时刻很丑,然后变得很美,就像丑小鸭一样

耶鲁公开课 - 死亡课程节选