viscous precipitate

例句：

1. 1. The oil was found to have a high viscosity, making it difficult to pump.
   发现油的粘度很高，难以泵送。
2. 2. The sediment settled at the bottom of the container, blocking the flow.
   沉积物在容器底部沉降，阻碍了流动。
3. 3. The viscous precipitate formed a thick layer on the surface of the liquid.
   粘滞沉淀物在液体表面形成了一层厚厚的膜。