But the sun, as seen from Earth, is nearly as large as a little fingertip held at arm's length-a size known to astronomers as half a degree wide.

但是太阳正如我们在地球上所见，好像举起手臂，看一臂之外的指尖那样大小——对于天文学家来说也就是半度宽。

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

以调焦的观点看，这意味着一座远山不过一臂之长。

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

一臂之长的一本书现在就更近了。

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B, James is at arm's length from News Corp, and he answers not only to his father but also to other shareholders.

ECONOMIST: Family businesses

He is a friend of Mr Reich, but labour's star is waning, so he keeps him at arm's length.

ECONOMIST: American politics

Mr Kellner concludes that "what distinguishes people who call themselves 'English' is a passion for keeping other countries at arm's length".

BBC: Is brand Britain losing its lustre?