cover in

详细解释:封盖

例句：

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