This is the only depth cue that involves two eyes.

这是唯一涉及两只眼睛的深度提示。

It took scientists a while to realize that having two eyes gives us depth information, because it’s not the only depth cue that we have.

科学家们花了一段时间才意识到， 拥有两只眼睛可以为我们提供深度信息，因为它不是我们拥有的唯一深度线索。