最初，我所能和外界交流的方式就是一个字母一个字母地在女友的手掌心里拼出单词。

Initially, the only way I could communicate was to spell out words, one letter at a time, on the palm of my girlfriend's hand.

youdao

他们的语言问题仅仅是因为DNA中一个核苷酸发生了改变，也就是说基因序列中有一个字母被改写了。

Their trouble with language had been caused by the change of a single nucleotide of dna-just one letter in the genetic sequence.

youdao

一个SNP就是只在一个基因序列的一个核苷酸中发生的变异；就像一个拼写变化只影响一个罕见的长单词中的一个字母。

A SNP is a variation in just one nucleotide of a genetic sequence; think of it as a spelling change affecting just one letter in an uncommonly long word.

youdao

So, if we look at what the other sub shells are called, essentially we're just converting the number to a letter.

我们来看看,另外的子壳层叫什么，本质上，我们就是把数字转换为，一个字母。

麻省理工公开课 - 化学原理课程节选

The number that you choose to rotate your letters by is what we call in cryptography, a key.

你选择的旋转字母的数量,就是所谓的加密学，一个密钥。

哈佛公开课 - 计算机科学课程节选

s2 So, I'm passing in the first character in s2, I'm making it uppercase and then I'm putting it back so casually speaking this is just capitalizing the first letter of whatever word the user typed in to s2.

那么，我把第一个字符传递给，我把它转换成大写的，然后存下来,简单说，这就是把用户输入s2中的单词,的第一个字母转换成大写的。

哈佛公开课 - 计算机科学课程节选