英语翻译Before roads needed traffic lights, railways had used si
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英语翻译
Before roads needed traffic lights, railways had used signals to control train traffic.In early days, these signals included a ball and something that looked like a kite.When the kite was on top,it meant danger; when the ball was raised,it was safe.
Before roads needed traffic lights, railways had used signals to control train traffic.In early days, these signals included a ball and something that looked like a kite.When the kite was on top,it meant danger; when the ball was raised,it was safe.
在公路需要交通信号之前,铁路已经使用信号控制火车的交通.早期的信号包括一个球和一个外观像风筝的物件.升起风筝表示危险,升起球表示安全.
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