sediment
n[U]
1 matter that settles to the bottom of a liquid 沉淀物
a wine with a gritty sediment 有沙粒状沉淀物的葡萄酒.
2 matter (eg sand, gravel, mud, etc) carried by water or wind and deposited on the surface of the land 沉积物(如沙、 砾石、 泥等).
In the first place, any scientific study requires that there be no preferential weighting of one or another of the items in the series it selects for its consideration.