科学素养与生活应用·英语30篇（3）
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How Your Phone Sends Messages
你的手机如何发送信息
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Your phone turns words into digital signals.你的手机将文字转化为数字信号。
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These signals travel through radio waves.这些信号通过无线电波传输。
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Cell towers receive and forward the signals.基站接收并转发这些信号。
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Another phone gets the signal and changes it back.另一部手机接收到信号并将其还原。
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The message appears on the screen in seconds.几秒钟后，信息就显示在屏幕上。
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No wires are needed for this process.此过程无需任何线缆。
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All this happens using invisible energy waves.这一切都依靠看不见的能量波完成。
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It is fast, safe, and works almost anywhere.它快速、安全，几乎 anywhere 都能使用。