When was Ancient Greece? How did ancient Greece begin? The first Olympic games and new discoveries How was Greece ruled? Activities About 2,500 years ago Greece was one of the most important places in ...

Watch Mr Smith explain more about writing to explain. Follow what he says carefully, and have a go at the tasks he gives you. Explanation texts often tell you about the parts of a process, usually ...

Abstract: Modern communication technology focuses on the development of digitalization, and digital multiplexing and demultiplexing technology is an important technology in communication technology.

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Abstract: We demonstrated a portable optical two-way time transfer scheme over a 120-m outdoor atmospheric link. The measured root-mean-square (RMS) fluctuation of the time deference between the two ...