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

我听到最后字是dubba-you，ex，why，zee。

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......封信！

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

三月来封信 这是第一封提到凯萨琳琼斯？

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

现在他们找到好几两一样符号 字字。

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

这遗传密码由简单字表组成，字，A，T，C和G （碱基）。

" Fast" has four letters and four sounds.

“快”有字和声音。

Can you fit that into your four letter code?

能把它字代码中吗？

And it's just a cool four letter word.

这只是一很酷字单词。

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

想象一下， 如果英文字表有字会是什么样子。

One of the two brother actors. Bridges. Four letters.

兄弟演员之一 姓布里吉斯 名字是字。

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

所以这星球上所有生命都是由 ATCG 构成，即 DNA 字。

Sometimes three or four letters together can make one sound.

有时三或字在一起可以发出一声音。

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字单词。

Part four: letters and sounds are not always the same thing.

第部分：字和发音并不总是一回事。

We also have another radio station, called " KNBC." Usually radio and television stations have four letters.

我们还有另一广播电台，叫做“KNBC” 。 通常电台和电视台有字。

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

它太简单了，主要由4被称为核苷酸基本物质组成。这就好比一只有4字字表。

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，哦，实际上是字。

These four letters of the genetic alphabet combine in various sequences to form the instructions for building all life on Earth.

遗传字表中这字以不同顺序组合，形成构建地球上所有生命指令。

As early as the 1970s, geneticists were transforming the four letters of DNA sequences into tunes that were, well, not exactly chart-topping.

早在 20 世纪 70 年代，遗传学家就将 DNA 序列字转化为曲调，嗯，并不完全是排行榜上佼佼者。

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.

在能够写出字后，我便告诉任何一会写字男孩，说我能写得和他一样好。