On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magnetic needle in a compass-box..
他在一根垂直的针头顶点，设置了一根水平的钢制细棍，它可以左右转动，就像罗盘里的磁针那样。
The compass came out of a cereal box, so why are we running the wrong way?
指南针是从燕麦片盒子里拿出来的 那我们为什么要走错误的路?。
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