There are two pairs of unbranched antennae, the first pair being vestigial in land-dwelling species.
Isopods have two pairs of antennae; one pair feels along the ground.
Isopods have two pairs of antennae; one pair feels along the ground.
将句子改写得更简单: There are two pairs of unbranched antennae, the first pair being vestigial in land-dwelling species. 输出: