A separation, an aperture, a fissure, or a short passage in an organ or a body part.
裂孔, 孔器官或身体部位中的孔隙、隙缝、裂隙或通道
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
What aperture are you using?
你使用多大的光圈?
