molt

Like other penguins, it undergoes an annual molt, replacing all its feathers in a few weeks.

和其他企鹅一样，它也经历一年一次的脱毛，在几周时间里替换掉所有的羽毛。

He said emperor penguins can spend months at a time in the ocean, coming ashore only to molt or rest, but did not know what might have caused this particular one to become disoriented.

他说帝企鹅可以一次性在海里带上数月，上岸只是为了脱毛换羽和休息。 但不知道是什么造成了这只特别的企鹅变得分不清楚方向。