It would need to deploy a parachute, descend through the clouds and transmit a GPS coordinate to a cell phone tower.
它需要打开降落伞穿过云层下降，把GPS坐标发射到手机基站。
If each person had to buy a cell phone tower just to use a mobile phone, how many people would have mobile phones?
如果每个人都要买一个蜂窝电话发射台才能使用移动电话的话，那还有多少人能用得起移动电话呢？
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.
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。
Such devices could also improve the reliability of cell phones, whose signals must be carefully timed as they travel from phone to tower.
这类设备也有利于改进移动电话的可靠性，因为当它们在电话基站之间漫游时，必须仔细校对时间。
Each CDMA mobile phone communicates with a cell tower 800 times a second just for its power management.
仅为了电力管理，每个CD MA手机就在一秒钟的时间里和手机发射塔通讯多达800次。
Each CDMA mobile phone communicates with a cell tower 800 times a second just for its power management.
仅为了电力管理，每个CD MA手机就在一秒钟的时间里和手机发射塔通讯多达800次。
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