一根一英里长的电线，如果在它的一端通电，电流立刻就会通向它另一端。
A wire a mile in length, if electrified at one end, becomes in the very instant electrified also at the other end.
拿起话筒，那一端的声音似乎从100英里以外传来。
Picking up the receiver the other voice seemed a hundred miles away.
只在半英里以外有一个警戒哨，位于铁道线上，桥的这一端有一名哨兵把守。
Only a picket post half a mile out, on the railroad, and a single sentinel at this end of the bridge.
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