名词
中文翻译：海胆
同义词：
['sea cucumber', 'sea urchin例句：1. Echinoids are a type of marine invertebrate that lives in the deep sea.（棘皮动物是一种生活在深海的海洋无脊椎动物。）']
例句：
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1. Echinoids are a type of marine invertebrate that lives in the deep sea.
棘皮动物是一种生活在深海的海洋无脊椎动物。
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2.The echinoids are known for their unique shell shapes and colors.
棘皮动物以其独特的壳形和颜色而闻名。
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3.Echinoids play an important role in the food chain as they are preyed upon by larger fish.
棘皮动物在食物链中扮演着重要角色，因为它们是更大鱼类的食物。