蛇类体内仍保留着退化的后肢骨骼。
Snakes still possess vestigial bones from their ancestral hind legs.
▼点击显示答案
Snakes still possess vestigial bones from their ancestral hind legs.
Snakes still possess vestigial bones from their ancestral hind legs.
Snakes still possess vestigial bones from their ancestral hind legs.
在 App 中完整学习这张卡片
在 App 中学习