single bond 单键 ; 单一合同 ; 债券 ; 依次为
pure single bond 真正单键
single-bond 单键
carbon single bond 原子可绕碳碳单键自由旋转
single-bond radius 单键半径
And we find the same thing for these two atoms here, it's not actually a double bond, it's somewhere between a single bond and a double bond.
而且我们发现这两个原子的情况是一样的，它其实不是一个双键，而是介于单键与双键之间的。
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。
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