1、Echinodermata is a phylum of marine animals that includes starfish, sea urchins, and sea cucumbers.
棘皮动物门是一类包括海星、海胆和海参在内的海洋动物的门类。

2、The Echinodermata exhibit unique characteristics such as a spiny skin, radial symmetry, and a water vascular system.
棘皮动物门表现出独特的特征，如有刺皮肤、辐射对称和水管系统。