Usually there is only one or two a year bright enough to be seen with the naked eye.
通常，一年只有一到两颗彗星明亮得肉眼可见。
But each eye has two pupils, one above water, one below.
只是它们的每个眼睛有两个瞳孔，一个在水面上，一个在水面下。
Each rig is equipped with two cameras—one representing the view of each eye.
每个立体摄影设备包含两个摄像头——分别模仿两只眼睛的视觉功能。
To make a stereoscopic image, you have to have two images: one for each eye.
为了使立体图像，你必须有两个图像：每个眼睛之一。
He has but one eye, and the popular prejudice runs in favour of two.
他只有一只眼，而一般的偏见则认为两只眼有利。
The first step is to create two cameras, one for each eye.
第一步创建两个摄像机，每只眼睛配备一个。
The first step is to create two cameras, one for each eye.
第一步创建两个摄像机，每只眼睛配备一个。
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