是指在微波波段，由于波长短，电波具有类似于光的特性，所以远距离微波通信必须采用中继方式，以实现超视距传播。但实际上电波的传播要受到地形和气候的影响，引起信号的反射、折射、绕射、散射和吸收等现象，导致信号产生衰落，从而降低了信号的传输质量。
由于对流层散射信道存在严重的衰落现象，故而传统的锁相环机制在散射通信中往往难以奏效。
Because of the fading characteristic in troposcatter channel, the mechanism of traditional phase locked loop is difficult to achieve the effect in troposcatter communication.
这一现象，将随着时间的推移以及现行文化的更进一步的衰落，而愈发地明显。
This becomes more and more apparent as time goes on and the present culture degenerates even further.
在危机开始的前几年这个现象开始改变，因为美元开始衰落同时新兴市场日益增长的需求也给全球的生产能力造成了压力。
That began to change a few years before the crisis as thedollar fell and emerging markets' growing appetite put pressure on globalproduction capacity.
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