资料来源 : WordNet®

bilaterally symmetrical
     adj 1: capable of division into symmetrical halves by only one
            longitudinal plane passing through the axis [syn: {zygomorphic},
             {zygomorphous}] [ant: {actinomorphic}]
     2: having identical parts on each side of an axis [syn: {bilateral},
         {isobilateral}, {bilaterally symmetric}]