由多径色散及多普勒频移造成的频率—时间选择性衰落是城市移动无线信道的一个重要特性。
The frequency time selective fading resulted from multipath dispersion and Doppler frequency shift is an important characteristic of urban mobile radio channel.
人口、资金等要素向城市移动是由于集中带来了集聚效益,这也是扩大意义上的外在规模经济。
The move of population and fund bring the rise of efficiency which is called scale economy effect.
我们看到年轻伊拉克儿童,要求食品和远从美国和英国的水士兵,他们通过对城市和省会城市移动,巴格达。
We see young Iraqi children, asking far food and water from Americas and British soldiers as they move through towns and cities towards the capital, Baghdad.
They're just random dots moving around this city.
它们只是随机的点,在城市里移动。
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