她说，添加重音和两个字母是为了让名字“更有异国情调”。

She was quoted as saying that the accent and double letters were added to make the name "more exotic".

youdao

这两个字母代表什么？

What do the letters N.B. stand for?

《新英汉大辞典》

在字母表中ab是头两个字母。

The letters ab begin the alphabet.

youdao

Remember, all you have to do is fill in the one or two-letter abbreviation for the chemical symbol.

记住，你们只要,用一两个字母的缩写,来代表化学元素就可以了。

麻省理工公开课 - 固态化学导论课程节选

You are required only to put the one or two-letter chemical abbreviation, the symbol.

你们只需要,用一两个字母来代表一个化学元素。

麻省理工公开课 - 固态化学导论课程节选

It looks a little something like that, and the screen doesn't quite do it justice here, Z but there's two alphabets; A through Z, and then A through Z, -- but the inner A through Z is on a small -- it has a smaller diameter; so it's a ring of letters.

它看起就像那样的东西，那个画面做的不是这么公正，这里有两个字母表，A到Z，然后A到，但是戒指内部的A到Z是在一个小直径的上面-,它有一个小的直径，所以它是一个有字母的戒指。

哈佛公开课 - 计算机科学课程节选