It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina.
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。
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.
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。
At just one square millimeter in size, the tiny device is a pressure monitor that is implanted in a person's eye.
该系统面积只有1平方毫米,用于监测压力,可以植入青光眼患者的眼部。
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