Liu Hongyan collects garbage during a patrol along the Great Wall in Beijing. CHINA DAILY Among those who walk the Great Wall of China in northern Beijing daily is Liu Hongyan, a 45-year-old ...
Capillary Method,Communication Systems,Core Particle,Differential Gain,Energy Loss,Erbium-doped Fiber,Fiber End,High Utilization Rate,Light Signal,Long-distance ...
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