Certain reactions open up a double or triple bond to insert various atoms, leaving only a single bond between the carbons. These are called addition reactions, because atoms are added to the carbons that were previously double bonded.

某些反应会打开双，从而插入各种，使碳之间仅保留单。这类反应为加成反应，因为被添加到了先以双相连的碳。

These are called addition reactions because atoms are added to the carbons that were previously double bonded.

这些被为加成反应，因为被添加到了之前双结合的碳。

Probably the simplest addition reaction and one that you've heard of is hydrogenation, in which a molecule of hydrogen, H2, is added across the bond.

可能最简单的加成反应就是氢化，即一个氢分H2加到双。

And, that a huge variety of polymers is based on the addition reaction of ethene based monomers, including Teflon.

而且，种类繁多的聚合物都是基于乙烯基单体的加成反应， 包括聚四氟乙烯。