| 释义 | 
		sand dollarn.(名词)  sand dollarClypeaster subdepressus- Any of various thin, circular echinoderms of the class Echinoidea, especiallyEchinarachnius parma,  of sandy ocean bottoms of the northern Atlantic and Pacific. 沙钱,饼海胆:任一种海胆纲的瘦且圆的棘皮类动物,尤指外剑虱目 ,生活于北大西洋和太平洋沙质洋底 
 
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