这使得它成为一种非常高效的复制文件的方法，特别是在不同的计算机之间，这也意味着，备份过程将很快完成。

This makes it a very efficient method of copying files, particularly between machines, and that means that the backup process completes quickly.

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并且它平坦的外形意味着其曾经旋转的很快，完成一个自转周期为16小时。

And its flattened shape implies that Iapetus once spun very quickly, completing a rotation in 16 hours.

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如果我们轮换着做这个工作，我们能很快地把它完成。

If we do the work turn and turn about, we can finish it quickly.

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