甲线,正线;
例句:
He got a wire to go home.
他接到一封让他回家的电报.
A little bird poised cleverly on a wire.
一只鸟灵巧、平稳地停在一根铁丝上.
If a wire was laid under water, the current would all leak away.
导线如果放在水下, 电流就会全部漏掉.