noun 下载 🔗分享 棘皮动物 An animal of the phylum Echinodermata, comprising radially symmetric, spiny-skinned marine animals including seastars, sea urchins, sea cucumbers, crinoids, and sand dollars. Examples : "While visiting the aquarium, my daughter learned that a starfish is an echinoderm with five arms and a spiny surface. " 参观水族馆时,我女儿了解到海星是一种棘皮动物,有五个腕足,表面多刺。 animal biology ocean nature science 与AI对话词汇游戏阅读练习