The penguins' feathers are "the most complicated and best insulating of any animal", he says. Over time they are damaged, so the penguins shed them annually.
外祖父母和子女的全家福，摄于1970年。（受访者供图）
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该款三折叠虽然首批售罄，但崔元俊坦言，由于工程太复杂且闭合时又厚又重，它目前只能算小众奢侈品。