中文说明：在某特定环境、特定频率的情况下，通信距离与损耗的关系
English Description：
In a specific environment and frequency, the relationship between communication distance and loss
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中文说明：在某特定环境、特定频率的情况下，通信距离与损耗的关系
English Description：
In a specific environment and frequency, the relationship between communication distance and loss