sediment

/ˈsɛdəmənt/

matter that has been deposited by some natural process

Chinese meaning: 沉积物；沉淀物

Rivers carry sediment that eventually forms deltas at their mouths.

河流携带沉积物，最终在河口形成三角洲。

The sediment at the bottom of the lake contains fossils of ancient organisms.

湖底的沉积物含有古代生物的化石。