高手翻译这段高难度科学文章！

A chemical equation is a shorter easier way to show chemical reactions using symbols instead of words.

一个运用符号而不是文字的化学方程式是一种几乎是最简单的体现化学反映的方法.
Most elements are represented by a one- or two- letter symbol. A compound is represented by a chemical formula, which shows the ratio of elements in the compound. The chemical formula also shows the number of atoms of each element in one molecule of a compound.
许多元素都被一两个字母代表.一种化合物被一个化学公式所代表,显示的元素在化合物中的比例. 化学公式也表示每个分子中每种元素的原子量.

A chemical equation is a shorter easier way to show chemical reactions using symbols instead of words.
化学方程式使用符号代替语言,是一种更简练的体现化学反映的方法.

Most elements are represented by a one- or two- letter symbol. A compound is represented by a chemical formula, which shows the ratio of elements in the compound. The chemical formula also shows the number of atoms of each element in one molecule of a compound.
大多数元素被描述成一个或两个的字母符号,一种化合物被表示成一个化学公式,它显示元素在该化合物中的比例. 和该化合物中每个分子所含每种元素的原子量的数目.