The optic disc is a blind spot because no light receptor cells are present in this area of the retina where the optic nerve and retinal blood vessels leave the back of the eye.

视盘是个盲点，因为视网膜的这个区域没有光感细胞，视神经和视网膜血管从眼睛后面的这个部位伸出去。

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The effective incident rays entered the eye from different parts of the reflection disc according to their incident angles.

有效投射光线依照其投射角，由光斑的不同部位进入眼中。

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A curious trait they all share is that they have only one eye: a large, pupil-less disc, red and glowing.

他们所共有的一个有趣的特征就是他们只有一只眼睛：一只巨大的、没有瞳孔的、散发着红光的眼睛。

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And, for a limited time, all three eye-popping films in the Transformers franchise will be available in a 7-Disc Limited Collector's Edition Blu-ray Trilogy featuring each film in high definition, Transformers: Dark of the Moon in high definition 3D, more than 10 hours of special features and a plaque of movie images signed by Bay.

ENGADGET: Transformers: Dark of the Moon clip breaks down shooting movies, special effects in 3D (video)

As Blu-ray.com notes, Amazon has listings for both a 2-disc Blu-ray edition and a 4-disc Blu-ray 3D version, but the one that's caught our eye is the just updated listing for Marvel Cinematic Universe: Phase One - Avengers Assembled.

ENGADGET: Avengers Blu-ray preorders listed, including massive 10-disc Marvel Cinematic Universe set