劍橋詞典a type of sea creature with raised areas or sharp points on its skin and a body made of five equal parts arranged around the centre 棘皮動(dòng)物（一種海洋生物，表皮有凸起或棘刺，身體呈五輻對(duì)稱(chēng)形） Echinoderms like the starfish live on the sea floor . 像海星這樣的棘皮動(dòng)物生活在海底。 返回 echinoderm