| 词汇 | sea urchin | 
| 释义 | sea urchin  noun [ C ] uk/ˈsiː ˌɜː.tʃɪn/ us/ˈsiː ˌɝː.tʃɪn/  海胆 a small sea creature that lives in water that is not very deep, has a round shell covered with sharp points like needles, and has flesh that can be eaten | 
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