想想蜂窝网络，我敢说你会想象到基站塔点缀这整个国家，向太空辐射着信号。
Think of a cellular network, and I'll bet you picture cellphone towers dotting the country, beaming signals into space.
辐射的放射水平还取决于手机类型、与最近的手机信号发射塔的距离以及同一区域内使用手机的人数。
Radiation levels also change depending on the phone type, the distance to the nearest cell phone tower and the number of people using phones in the same area.
最后，当手机尝试联系信号塔时，它释放大部分的辐射。
Finally, cell phones emit the most radiation when they are attempting to connect to cellular towers.
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