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Nowadays when we are walking down to the street, we could find technology everywhere.
When a passenger walks by me, he wears headphones and seems like listening to the song, but if
You look closer, you will find that he was talking. In the beginning, people will have thought he was talking to someone next to him, but in fact, he was calling through headphones. The current technology has made communication very convenient and simple to used. It is no longer necessary to send a letter that needed wait for a week as it was before, and it is very costly.

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