One could easily, for example, differentiate between a red cell and a neuron, but a skilled biologist who's looked at many, many different cells could differentiate between different types of neurons.

普通人可以很轻易的,分辨出神经元和红细胞,然而一个训练有素的生物学家,辨识过许多不同细胞之后,能够分辨出不同种类的神经元

耶鲁公开课 - 生物医学工程探索课程节选