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.

 
  • 鳃盖,覆盖在一孔或缝隙上的盖,如一些鱼类的鳃或覆盖在蛇或其它软体动物身上的角质壳。
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