[计] 选择衰减

selective fading的用法和样例：

例句

It reduces the effect of frequency-selective fading by dividing the transmission bandwidth into many narrowband subcarriers, each of which exhibits approximately flat fading.透过将可用频宽分割成许多窄频且遭受近似平坦衰落的子载波，它可减低频率选择性衰落的效应。

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