An animal, such as an insect or a mollusk, that lacks a backbone or spinal column.
An animal, such as an insect or a mollusk, that lacks a backbone or spinal column.
无脊椎动物缺少脊骨或脊柱的动物，例如昆虫或软体动物
An animal, such as an insect or a mollusk, that lacks a backbone or spinal column.
无脊椎动物缺少脊骨或脊柱的动物，例如昆虫或软体动物