近距离通信技术需要一个安全的无线数据传输方式，而移动支付对此的要求更为苛刻。

Near Field Communication technology can provide a secure, wireless way to transfer data, and it could be critical for mobile payment.

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准移动闭塞信号系统研究的追踪列车间的安全间隔距离与旧的信号系统下相比较短，缩短了列车的追踪间隔时间，有利于提高铁路通过能力。

Compared with the old signal system, the (signal system of) quasi-moving block shortens the safe distance of inter-train tracking interval and improves railway passing capability.

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几百万年后地球将因此而移动到安全距离距太阳2.25亿公里的轨道。

Over millions of years, this would move the earth to a comfortable 225 million km orbit out from the sun.

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