它的视网膜上每平方毫米有一百万个视锥细胞，所以它能分辨出很细微的视觉差别。
It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina.
章鱼每平方毫米的皮肤上可能有几百个这样的色袋，根据章鱼品种的不同，色袋可以有多达五种不同的颜色。
There might be a couple hundred of these color sacks per square millimeter of the octopus' skin, and depending on the species, they can come in as many as five different colors.
单位面积阳性神经元数即每平方毫米面积中所含阳性神经元数量。
Number of positive neurons of unit area refers to the positive neuron counts in each square millimeter.
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