它每分钟移动一英寸，用肉眼就能看到。
Its movement - an inch every minute - could be seen with the naked eye.
这些的电子仅仅沿着电线作缓慢移动，每分钟约走一英寸左右。然而，只要电路一接通它们便一齐开始行动。
The separate electrons travel only slowly along the wire, at about one inch a minute, but they all start to move together immediately the electric circuit is complete.
末端质量大于0.02公斤（0.04磅）的玩具上的绳在以80转每分钟的速度旋转时长度应小于50厘米（20英寸）。
Toys with an end mass greater than 0.02 kg (0.04 lb) shall have cord length less than 50 cm (20 in. ) measured when rotating at 80 r/min.
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