文件名称：Technology 360 - Cell Phone
文件大小：15.41MB
文件格式：PDF
更新时间：2018-06-09 17:38:54
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The cell phone is a marvel. The wireless technology behind it has revolutionized how billions of people around the world communicate. It was introduced in a few select areas in the early 1980s, and now the technology is used everywhere. People living in areas that were once considered too remote for wired telephone networks now have the ability to stay in touch wirelessly.