沉淀物

rú guǒ niú nǎi gān jìng zé nǎi píng dǐ bù bù yīng yǒu chén diàn wù

如果牛奶干净，则奶瓶底部不应有沉淀物。

If milk is clean, there should be no sediment in the bottom of the bottle.

shā lì huò chén diàn wù jù jí de xiàn xiàng

沙砾或沉淀物聚集的现象

the phenomenon of sediment or gravel accumulating