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。

youdao

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。

youdao

But members of the Digital Due Process Coalition say sending an e-mail should be no different from mailing a letter that is protected by law from being opened.

VOA: standard.2010.06.22

Let's forget about a letter, let's stick with an e-mail, or a text message.

就算你没有写过信，写电子邮件，发短信也算一种写作。

普林斯顿公开课 - 人性课程节选

We should call it E-flat and put it up on the E line because there's kind of rule here that you have to use up each letter name in turn, each letter name in turn.

我们应该称之为降E,把它放在E的谱线上,因为这算是一个规则,要依次使用每个字母,依次用每个字母

耶鲁公开课 - 聆听音乐课程节选

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It goes - I believe the first letter is E because that's the most used letter in the alphabet.

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