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

我听到最后四字是dubba-you，ex，why，zee。

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

玛莎，这些是给我家乡的亲友的信件......四封信！

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

三来四封信 这是第一封提到凯萨琳琼斯的？

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的 四字的字。

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

这遗传密码由简单的字表组成，四字，A，T，C和G （碱基）。

" Fast" has four letters and four sounds.

“快”有四字和四。

Can you fit that into your four letter code?

你能把它放入你的四字代码中吗？

And it's just a cool four letter word.

这只是一很酷的四字单词。

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

想象一下， 如果英文字表有四字会是什么样子。

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

兄弟演员之一 姓布里吉斯 名字是四字。

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

所以这星球上的所有生命都是由 ATCG 构成的，即 DNA 的四字。

Sometimes three or four letters together can make one sound.

有时三或四字在一起可以发出一。

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字的单词。

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

第四部分：字和发并不总是一回事。

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四字。

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被称为核苷酸的基本物质组成。这就好比一只有4字的字表。

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，然后是路的右侧，我们看到三，哦，实际上是四字。

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

遗传字表中的这四字以不同的顺序组合，形成构建地球上所有生命的指令。

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 代，遗传学家就将 DNA 序列的四字转化为曲调，嗯，并不完全是排行榜上的佼佼者。

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.

在能够写出四字后，我便告诉任何一会写字的男孩，说我能写得和他一样好。