a type of sea creature with a hard shell in two parts that can close together tightly, and a soft body that can be eaten

A quahog is a name for a type of hard-shell clam. 圆蛤是硬壳蛤的一种。

Hard-shell clams are usually found in deeper waters, whereas the soft-shell variety lives in shallow tidal regions. 硬壳蛤蜊通常生活在较深的水域，而软壳蛤蜊则生活在浅潮区域。