dithecal

例句：

1. 1. The dithecal creature has two heads and four limbs.
   这种双头动物有两个头和四条腿。
2. 2. Polydactylism is a condition in which an individual has more than two limbs or toes.
   多指症是一种个体拥有超过两个肢体或脚趾的情况。
3. 3. In some species of lizards, the dithecal condition is common.
   在一些蜥蜴物种中，多指症很常见。