And the next letter is 'E'—'E' is about expectations.

下一个字母是“E”，“E”是关于期望（expectations）的。

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You've made a mistake -- you've left out the letter e.

你出了一个错， 把字母e 落了。

《新英汉大辞典》

The illustration above is a concept image showing what it would look like with the lens displaying a digital overlay of the letter E.

上面的插图是一幅概念图片，显示了戴上这种眼镜会看到的情景：画面上叠加了一个字母E。

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