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.

youdao

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.

youdao

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.

youdao