但是，高速公路的提案预计会收到来自道路安全维护者和环保人士的强烈反对。他们指出汽车在高速公路上以更高的速度行驶时，并不会明显提高燃油效率。

But the motorway proposal is expected to receive stiff opposition from road safety campaigners and environmentalists who point out that cars are far less fuel efficient at the higher speed.

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K21可以以每小时70公里的速度在铺设的道路上行驶，喷气推进系统能每小时加速7.8公里，以这速度可以穿越过一条河流。

The K21 can travel as fast as 70 kilometers per hour on paved roads and cross a river at a speed of 7.8 kilometers per hour with the help of its water-jet propulsion system.

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在城市道路总长度一定，机动车平均行驶速度一定的情况下，希望城市道路网的通行能力越大越好。

For given total length of city roads and average speed of motor vehicles, maximizing the traffic capacity of the city road network is always desired.

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