Proteins are long chains of building blocks called amino acids, the specific number and arrangement of which makes each protein—whether it makes up your hair or carries oxygen in your blood—unique.
Like alcohols, fatty acids are molecules that have lots of hydrogen and carbon atoms, and a small amount of oxygen (in their case two oxygen atoms, rather than one).
脂肪酸和醇类很相似，它有着大量的氢原子和碳原子，以及数量很少的氧原子(它还有两个氧原子而非一个)。
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The fatty acids are then converted by the organisms to an aldehyde that includes a carbon atom bonded to an oxygen atom (together they create what's called a carbonyl group).