const input = Stream.pull(source, transform1, transform2);
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.
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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
输入：nums = [2,6,4,8,10,9,15]