double bond

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So really, you can not ever rotate a double bond, it makes your molecule very rigid.
实际上，你不能转动一个双键，它使得你的分子很坚固。
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。
Electrons can cause this double bond to rotate, which places part of the wheel in close proximity to a bulky side-molecule attached to the hub.
电子可以使这个双拼接口旋转，使得轮子的一部分紧靠连接轮毂的一个大型从属分子上。

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。
麻省理工公开课 - 化学原理课程节选
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。
麻省理工公开课 - 化学原理课程节选
And something that we'll see later on is that triple bonds, for example, are going to be stronger than a corresponding double bond or a corresponding single bond.
而我们以后还会看到三键，举例来说，应该更强，相较于相应的双键,或者相应的单键来说。
麻省理工公开课 - 化学原理课程节选

The citral molecule has a double bond in its tail, which, when it comes into contact with acid, forms a circular structure.
FORBES: Magazine Article

a type of chemical bond consisting of two covalent bonds linking two atoms in a molecule