This transition to living in the sea involved changes from paddling with limbs to undulating the body to oscillating a tail, such as the horizontal tail flukes in modern whale species.
这种转变包括从用前肢划水到身体波动再到尾巴摆动，就像现代鲸鱼的水平尾鳍。
This transition to living in the sea involved changes from paddling with limbs to undulating the body to oscillating a tail, such as the horizontal tail flukes in modern whale species.
这种转变包括从用前肢划水到身体波动再到尾巴摆动，就像现代鲸鱼的水平尾鳍。
应用推荐