Beijing and other cities have tried to improve air quality by switching power plants from coal to natural gas and rolling out fleets of electric buses and taxis.
北京和其他城市尝试通过将发电厂由燃煤型转换到天然气燃烧以及推出电动公交和出租车的方式改善空气质量。
Historically these aircraft were universal machines, capable of both establishing air superiority and carrying out powerful strikes on ground targets and enemy fleets.
历史上，这些飞机都是可以执行多种任务的，既可以参加空战，也可以携带重武器去攻击地面和海面目标。
Air traffic in Nigeria has more than doubled to over 8 million passengers a year in the last seven years, but the ageing airports and fleets have struggled to cope with the boom.
尼日利亚的航空业务在过去的7年内翻了一番每年达到了8百万名乘客。但陈旧的飞机和机组人员不得多拼命地应对如此红火的生意。
He hopes, no doubt, that all this may be ac-accomplished before the Winter comes and that he can overwhelm Great Britain before the fleets and air power of the United States will intervene.
毫无疑问，他指望在冬季到来之前结束这一切，并在美国海军和空军进行干涉之前击溃大不列颠。
He hopes, no doubt, that all this may be ac-accomplished before the Winter comes and that he can overwhelm Great Britain before the fleets and air power of the United States will intervene.
毫无疑问，他指望在冬季到来之前结束这一切，并在美国海军和空军进行干涉之前击溃大不列颠。
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