Let's learn to write the first three letters.

让我们学写前三个字母。

youdao

IN the first three letters, my father expressed his concern for my silence and asked the reason for it.

在前三封信里，我的父亲对我没有去信感到不安，问我是什么原因。

youdao

Uri found that the name of a person's workplace more closely correlated with the first three letters of a person's name.

乌里发现，一个人工作单位的名字和此人姓名的前三个字母关系最为密切。

youdao

The first three letters of E. Coli are Eco, so Eco.

大肠杆菌的前三个字母是Eco,也就是酶名字中的Eco

耶鲁公开课 - 生物医学工程探索课程节选

So to type the word "wish, " I'd find the first three letters in squares, selecting each of them.

WSJ: From QWERTY to Quirky: New Ways to Type on Glass

He did this simply so that the paper might be credited to Alpher, Bethe, Gamow, close enough to the first three letters of the Greek alphabet.

ECONOMIST: Hans Bethe, nuclear physicist, died on March 6th, aged 98

The officials, linguistic and behavioral experts who have been analyzing the three known anthrax letters, made their assessments more than a month after the first anthrax outbreak in Florida, where no letter was ever recovered -- and at a time of growing congressional frustration over the lack of progress in the investigation.

CNN: FBI profiles anthrax letter writer