英文：A lid or flap covering an aperture, such as the gill cover in some fishes or the horny shell cover in snails or other mollusks.
中文：鰓蓋覆蓋在一孔或縫隙上的蓋，如一些魚類的鰓或覆蓋在蛇或其它軟體動物身上的角質殼
英文：Any of various mollusks that bore into soft rock or wood.
中文：鑽蛀蟲鑽入松軟岩石或木頭中的軟體動物
英文：A smooth, lustrous, variously colored deposit, chiefly calcium carbonate, formed around a grain of sand or other foreign matter in the shells of certain mollusks and valued as a gem.
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