小朋友有没有想过，为什么自己会长得像爸爸妈妈——比如爸爸的酒窝、妈妈的卷发？其实，在我们身体的每一个细胞里，都藏着一本极其微小的说明书，叫作DNA。这本说明书用最简单的密码，写下了造出一个人所需要的全部信息。

Have you ever wondered why you look like your mom and dad, maybe your dad's dimples or your mom's curly hair? Inside every single cell in your body, there is a tiny instruction manual called DNA. Written in the simplest of codes, this manual holds all the information needed to build a person.

DNA的形状十分特别，科学家把它比作一架拧成麻花状的软梯子，学名叫双螺旋。这架梯子上的每一级台阶，都由两个字母配对组成，一共只有四种字母，可是不同的排列顺序，却能写出地球上每一种生命独一无二的说明书。

DNA has a very special shape. Scientists describe it as a soft ladder twisted into a spiral, known as the double helix. Every rung of this ladder is made from a pair of letters, and although there are only four kinds of letters in total, their different ordering can write a one of a kind instruction manual for every living thing on Earth.

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