一臂之长的一本书现在就更近了。
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.
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.
我之前用过这样的工作灯，它距离你很近时发出的光是很微弱的，但是在距离你一臂之长的距离时，它会发出很强的光，这样就会使得你的工作顺利进展。
I have used such lights before, which merely light what is just in front of you, but anything at arm's length is fairly well illuminated and progress can be made easily enough.
我之前用过这样的工作灯，它距离你很近时发出的光是很微弱的，但是在距离你一臂之长的距离时，它会发出很强的光，这样就会使得你的工作顺利进展。
I have used such lights before, which merely light what is just in front of you, but anything at arm's length is fairly well illuminated and progress can be made easily enough.
应用推荐