... 释义：上肢长,臂长 upper extremity length 杠杆率, 杠杆臂长比 leverage,leverage ; lever ratio,lever ratio 一臂长 一臂长 armlang ...
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在一臂长左右的距离打开瓶子，凶手便可避免吸入这种致命元素。
Opening the bottle at arm's length would be enough to protect the killer from receiving a deadly dose.
试一下这个小戏法：把一块橡皮或者相似的东西举起一臂长，在月亮接近地平线和后来升得更高看起来小一些的时候来测量它。
Try this trick, though: Using a pencil eraser or similar object held at arm's length, gauge the size of the moon when it's near the horizon and again later when it's higher up and seems smaller.
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