Dàduōshù dòngwù de shēntǐ chéng liǎngcè duìchèn, ér shuǐmǔ de shēntǐ chéng fúshè duìchèn.
Most animals have bilateral symmetry, while a jellyfish has radial symmetry.
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两侧对称 means one plane divides the body into matching left and right halves, usually with a head end and a tail end. It contrasts with the 辐射对称 (radial symmetry) of jellyfish and sea anemones. Animals built this way are 两侧对称动物 (the Bilateria).
