At the same time, M-QAM mapping can be used in OFDM for improving data transportation speed.

同时在OFDM调制时可以采用M - QAM映射方式，提高短波跳频系统的信息传输速率。

youdao

The communication time-delay concludes the delay of remote control commands and telemetry signals, which is brought by light transportation speed.

通信延迟包括遥控指令的延迟和遥测信号的延迟，主要是由光传播速度造成的。

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Different transportation mode has different features in transportation speed, transportation capability, stability and etc, which result in different costs and the level of customer services.

不同的运输方式在运输速度、运输能力、可靠性等方面有着不同的特点，从而导致了不同的成本和客户服务水平。

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The Obama administration is also putting money into transportation to speed recovery.

VOA: special.2009.11.06

With investments in high-speed transportation and communication infrastructures, the creative class should be persuaded to return to the periphery to enjoy lower housing costs and a higher quality of life, and contribute to a local economy that can then provide sustainable services.

ECONOMIST: Letters

Silver and copper are smaller markets, but their adherents argue that the industrial demands for the shiny stuff by nations that must build out their infrastructure products such as the fast speed transportation system in China or the ports of India, Thailand another emerging markets clearly suggest a shortage of silver and copper, possibly iron ore as well.

FORBES: Smart Money Is Long Gold, Silver, Copper, Oil And Zero Coupon Treasuries

Nice has fantastic public transportation with high-speed trains, a modern tramway and comprehensive bus routes.

BBC: Nice on a budget