So, if we take a look at what a single bond is, and let me grab some molecules here.

如果来我们看一下单键，让我拿个分子。

Remember, every time we have two electrons that are being Shared, that's a single bond.

还记得，每次我们有两个电子被共用，我们就有了一个单键。

We would predict to see a single bond between lithium, and it turns out that's what we see.

我们可以预测在锂中会看到一个单键，而实际上确实是这样的。

So if we look at its length, it's actually shorter than a single bond, but longer than a double bond.

因此如果我们看它的键长的话，它实际上比单键更短，却比双键更长。

Saturated is a single bond between carbon atoms in the fatty acid . Unsaturated is the double bond.

不同的碳长度脂肪酸和不同数量的双结合给脂肪以独特的特性。