貝殼是海洋軟體動物(如蝸牛、蛤蜊和牡蠣)堅硬且具保護性的外骨骼。這些結構主要由動物的外套膜分泌的碳酸鈣組成,漂流到世界各地的海灘,呈現出各種美麗的形狀、大小與色彩。 Seashells are the hard, protective outer exoskeletons of marine mollusks, such as snails, clams, and oysters. Composed primarily of calcium carbonate secreted by the animal's mantle, these structures wash up on beaches worldwide and come in a vast array of beautiful shapes, sizes, and colors.
第一類 Category 1