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Starfish are actinoid -- that is, they are radially symmetrical.是什么意思？

Starfish are actinoid -- that is, they are radially symmetrical.

海星呈放射性形状 —— 那就是说, 它们是呈对称的放射状.

相关词汇
starfish are actinoid that is they radially symmetrical

starfish

n. 海星（一种海洋动物）；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

actinoid

adj. 放射线状的；

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

is

vt.& vi. 是（be的三单形式；n. 存在；

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

radially

--

symmetrical

adj. 对称的，匀称的；
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