群落演替处于快速衰落阶段，退化迹象十分明显。
The community succession was on the comedown phase rapidly, and the evidence of degeneration was naked.
由于种种原因，川西林盘正在快速衰落，由此带来的负面效应将在农村建设中逐步呈现出来。
For various reasons, Linpan of western Sichuan is rapidly declined, which brings negative effects that will gradually appear in rural construction.
无线环境中存在多径衰落、 多谱勒频移和信道快速时变等许多不利因素。
There are lots of disadvantages in wireless environment, such as multi-paths fading, Doppler frequency shift and fast time varying of channel.
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