伦敦的出租车司机之所以效率这么高，是因为他们受到非常严格的训练才获得了专用出租车驾驶执照。

The reason London taxi drivers are so efficient is that they all have gone through a very tough training period to get the special taxi driving license.

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在一个美军无法展开地面作战的国家使用无人驾驶飞行器进行军事打击，这激起了关于合法性、效率，和道德的激烈争论。

The use of unmanned aerial vehicles in a country where U.S. forces are not able to conduct ground operations has stirred heated debates over the legality, effectiveness, and morality of these strikes.

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自动驾驶汽车可以降低交通拥挤，改进燃油效率并且将交通事故降低到最低水平。

Self-driving cars could reduce congestion, improve fuel efficiency and minimise the number of road accidents.

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