HSK 7-9
海绵
hǎimián名
(zoology) sea sponge; (esp.) dried sea sponge; sponge (made from polyester or cellulose etc); foam rubber
她用海绵擦净厨房台面。
Tā yòng hǎi mián cā jìng chú fáng tái miàn.
She wiped the kitchen counter clean with a sponge.
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Appears across levels (7-9) in the HSK 3.0 word list.