一臂之长的一本书现在就更近了。

And a book that was at arm's length is now much closer.

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以调焦的观点看，这意味着一座远山不过一臂之长。

From a focusing standpoint, this means that a distant mountain is now up at arm's length.

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你看起来像是其中任意两颗星的距离都是一臂之长。

You'll see that any two Great Square stars are farther apart than the width of your hand.

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