名词
中文翻译：海胆
同义词：
['spineless', 'cephalopod']
例句：
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1.Echinus is a type of sea snail with a long, pointed shell.
棘皮动物是一种有长而尖的壳的海蜗牛。
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2. The echinus was found in the deep ocean, where it lives in colonies.
这种棘皮动物在深海中被发现，以群居生活。
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3. Echinus is an important food source for some species of fish and whales.
棘皮动物是某些鱼类和鲸类的重要食物来源。