清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。
Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.
请尽早使用洁净的水冲洗水泵外罩以清除淤泥。
As soon as possible, flush clean water down the casing to remove sediment and silt.
软土路段及浸水路基，先清除淤泥，按设计进行加固处理。
About the sections of soft soil and water immersion roadbed, first removal of the sludge, then reinforce it according to design.
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