河口沉积了淤泥。

The river deposited silt at its mouth.

《新英汉大辞典》

一旦完成了这个，河流带来的淤泥会沉积在此处，回报是丰厚的：产量是被雨水滋养的土壤的四到五倍。

Once this was done and the silt carried down by the rivers was planted, the rewards were rich: four to five times what rain-fed earth would produce.

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这种色调是由淤泥造成的，淤泥被冰川分成很多远离谷壁的细碎的小块，沉积在湖中。

The hue is caused by the silt that is finely ground away from the valley walls by the glacier and deposited in the lake.

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