我们分辨出地球人的体型和肤色有些微的差别，这些几乎无法察觉的差别看上去会引起无穷无尽的麻烦。
We appreciate that human beings come in slightly different models and colors, and to you these nearly imperceptible differences seem to cause no end of trouble.
立体视觉- 人类的左右眼接收有着细微差别的图像能够让大脑察觉到深度的存在。
Stereoscopic Vision - Human's left and right eyes receive slightly different images that allow the brain to perceive depth.
这种差别一般读者几乎是察觉不到的。
The difference is scarcely perceptible to the average reader.
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