单词：sea urchin
sea urchin的用法和样例：
例句
- A fine,sharp projection,as a spine of a sea urchin or a crystal.针状物精细尖锐的突出物，如海胆的脊椎骨或水晶球。
- The hard outer shell of sea urchins are commonly called tests.海胆的坚硬外壳通常被称为甲壳。
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