And cars, buses and trams Move along slowly In big traffic jams.
和小汽车，公共汽车和有轨电车在大的交通堵塞过程中缓慢地向前走。
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.
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。
You would press your finger along the edge and move it very, very slowly.
你就会用手指按着书桌边，非常非常缓慢地移动。
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