So DNA is a set of instructions for how our bodies work written using a chemical code of four letters – A, T, C, G. But sometimes the code contains mistakes.

那么，DNA就是A、T、C、G四种碱基编码组成指示机体运转遗传指令。但是有时候这些编码中会出现错误。

Marsha, these are letters to my family and friends back at home......four letters!

玛莎，这些是给我家乡亲友信件......四封信！

They've got a repeating four- letter word ending with two symbols that stand for L.

现在他们找到好几个两个一样符号 四个字母字。

I heard that the last four letters were dubba-you, ex, why, zee.

我听到最后四个字母是dubba-you，ex，why，zee。

A little one—it's not like OK comes from Latin or Greek and shows ignorance on the part of someone who spells it out with four letters.

小写那个——不像“OK”来自拉丁语或希腊语，用四个字母拼写出来就暴人无知。

After I was able to make four letters, I would tell any boy who could write that I could write as well as he did.

在能够写出四个字母后，我便告诉任何一个会写字男孩，说我能写得和他一样好。

And then we hear it's on City Road, then the road to the right and we see three, oh actually four letters there.

然后我们听到它在城市路，然后是路右侧，我们看到三个，哦，实际上是四个字母。

It was too simple. It had just four basic components, called nucleotides, which was like having an alphabet of just four letters.

它太简单，主要由4个被称为核苷酸基本物质组成。这就好比一个只有4个字母字母表。

The code comes out to be a fairly simple alphabet, four letters: A, T, C and G.

这个遗传密码由简单字母表组成，四个字母，A，T，C和G （碱基）。

Four letters in three months and this is the first mention of Kathleen Johns?

三个月来四封信 这是第一封提到凯萨琳琼斯？

Imagine what it would be like if the English alphabet had four letters.

想象一下， 如果英文字母表有四个字母会是什么样子。

Don’t get me too excited because I use four letter words when I get excited.

不要让我太兴奋， 因为当我兴奋时我会使用四个字母单词。

And that's one four letter word that most people don't like.

那是一个大多数人不喜欢四个字母词。

And it's just a cool four letter word.

这只是一个很酷四个字母单词。

Four letters four words. Four letters four words.

四个字母四个词。四个字母四个词。

Takeaway four, letter writing is a hobby.

第四点，写信是一种爱好。

The first four letters, S-E-A-M, when used on their own, form a noun.

前四个字母S-E-A-M单独使用时，构成一个名词。

Can you fit that into your four letter code?

你能把它放入你四字母代码中吗？

So all life on this planet is made in ATCGs, the four letters of DNA.

所以这个星球上所有生命都是由 ATCG 构成，即 DNA 四个字母。

Using these kinds of tests can actually be harmful, because they are considered correct, and therefore people are put into boxes and treated in a different way, just because of four letters that were spat out by a personality test.

使用这类测试实际上可能有害，因为人们认为这些测试是正确，因此人们会被归入不同框框，并因一个性格测试吐出来四个字母而被区别对待。