在LED快速通断中，通过光源的变化比率进行可能的编码进行发送0和1。

It is possible to encode data in the light by varying the rate at which the LEDs flicker on and off to give different strings of 1s and 0s.

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这里快速通道、地铁、城际铁路等四通八达的立体交通网络成为商品集散的最佳条件。

Here, the convenient three-dimensional transportation networks, such as the fast tracks, subways and inter-city railways, become the best condition for commodity distribution.

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如果有一件事我们觉得还能指望的，那就是在一通慌乱的电话打给911时能得到快速有效的回应。

If there's one thing we think we can count on, it's that a frantic call to 911 will bring a swift and effective response.

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