How did the lens, retina, optic nerve, and all the other parts in vertebrates that play a role in seeing suddenly come about?
当突然看到物体时，脊椎动物的晶状体，视网膜，视神经，和所有其他部件是如何发挥作用的？
How did the lens, retina, optic nerve, and all the other parts in vertebrates that play a role in seeing suddenly come about?
当突然看到物体时，脊椎动物的晶状体，视网膜，视神经，和所有其他部件是如何发挥作用的？
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