Fúshè duìchèn de dòngwù méiyǒu míngquè de tóu wěi.
Radially symmetric animals have no clear head or tail.
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辐射对称 contrasts with 两侧对称 (bilateral symmetry, the body plan of most animals). Radial animals — cnidarians, ctenophores, adult echinoderms — live attached or drifting, with sensory organs arranged around a central axis.
