A crustacean is an animal with a hard shell on the outside, several pairs of legs, and a body made of parts that join together. Crabs, lobsters, prawns, and shrimp are crustaceans. Most live in water, though actually some, like the woodlouse you find under a flower pot, live on land.

A crustacean甲殼類動物 is an animal with a hard shell on the outside是一種外面有硬殼的動物，several pairs of legs有好幾對腳，and a body made of parts that join together身體由一節一節連在一起的部分組成。Crabs, lobsters, prawns, and shrimp are crustaceans螃蟹、龍蝦、明蝦和蝦都是甲殼類。Most live in water大部分住在水裡，though actually some, like the woodlouse you find under a flower pot, live on land不過事實上有些，像花盆底下常見的鼠婦，是住在陸地上的。

The hard covering is not like our skin: it is a suit of armour the animal has to shed when it grows.

The hard covering is not like our skin那層硬殼跟我們的皮膚不一樣：it is a suit of armour the animal has to shed when it grows它是一套盔甲，動物長大時得把它蛻掉。

People often put all shellfish in one pile, but an oyster or a clam is not a crustacean — that is a different kind of animal with a softer body inside two shells. The word belongs in science class and in careful cooking talk; at a night market you are more likely to hear crab, shrimp, or lobster.

People often put all shellfish in one pile人們常常把所有帶殼海鮮都歸成一類，but an oyster or a clam is not a crustacean但牡蠣或蛤蜊不是甲殼類——that is a different kind of animal with a softer body inside two shells那是另一種動物，身體比較軟、裝在兩片殼裡。The word belongs in science class and in careful cooking talk這個字屬於科學課，也屬於講究的烹飪用語；at a night market you are more likely to hear crab, shrimp, or lobster在夜市你比較會聽到的是「螃蟹」「蝦」或「龍蝦」。