All the other naming rules apply to alkenes and alkynes too.

所有的名规则也适用于烯。

So, three words representing three different groups of organic compounds. Alkanes for all single bonds, alkenes if they contain double bonds, and alkynes if they contain one or more triple bonds.

因此，这三个词分别代表三类不同的有机化合物。烷是指所有键均为单键的化合物；烯是指含有双键的化合物；是指含有一个或多个三键的化合物。

The fatty acid chains, they have long hydrocarbon chains, are what we're mostly concerned with here. They can be alkanes or alkenes, sometimes even rarely alkynes.

脂肪酸链具有长的碳氢链，这是我们主要关注的分。它们可以是烷或烯，有时甚至是罕见的。

You also learned a little bit about cis-trans isomerism and learned a few important reactions of alkenes and alkynes such as hydrogenation, halogenation, and polymerization.

你还了解了一点关于顺反异构体的知识，并学习了一些烯的重要反应，如氢化、卤化聚合。

They can be alkanes or alkenes, sometimes, even rarely, alkynes.

它们可以是烷或烯，有时甚至是罕见的。

All the other naming rules apply to alkenes and alkynes too. For instance, the main carbon chain, the longest one, is numbered in such a way that the various components, including the double bond, have the lowest numbers possible.

所有名规则同样适用于烯。例如，主碳链（即最长碳链）的编号方式应使包括双键在内的各个组成分具有尽可能低的编号。

It's a polymerized alkene, but the molecule itself is an alkane.

它是聚合烯， 但分子本身是烷。

Now, the bonds in alkenes have a few tricks up their sleeves.

现在，烯中的化学键有一些特殊的技巧。

Now, the bonds in alkenes have a few tricks up their sleeves, not as simple as you might imagine. Single bonds, also called sigma bonds, are pretty simple, and carbon atoms attached by them can rotate around the bond freely.

现在，烯中的键有一些复杂之处，并不像你可能想象的那样简单。单键，也称为σ键，相当简单，通过它们连接的碳原子可以自由地绕键旋转。

If they've got a double bond, we call them alkenes, and those with triple bonds are alkynes.

如果它们含有双键，我们称它们为烯，而含有三键的则称为。

How do you remember which is which? Well, I have a trick that I use. There's only one letter changing here. A in alkanes changes to E for alkenes and then to Y for alkynes.

如何记住它们各自代表什么？我有个小技巧。这里只有一个字母在变化：烷（alkanes）中的 A 变为烯（alkenes）中的 E，再变为（alkynes）中的 Y。

There's only one letter changing here: A in alkanes changes to E for alkenes and then to Y for alkynes.

这里只有一个字母在变化：烷中的A变成了烯中的E，然后再变成中的Y。

Just to note to avoid confusion: polyethylene has that " -ene" sound in it, right, but it's not an alkene because all those double bonds get broken to form new sigma bonds.

请注意以避免混淆：聚乙烯中有“-ene” 的发音，对吧，但它不是烯，因为所有这些双键都会断裂形成新的 sigma 键。

That may not sound like a big deal at first, but alkenes and alkynes don't have that kind of freedom, and that simple fact has a huge affect on their properties.

这乍一听可能不算什么大不了的事，但烯就没有这种自由度， 这个简单的事实对性质产生了巨大影响。

That may not sound like a big deal at first, but alkenes and alkynes don't have that kind of freedom, and that simple fact has a huge effect on their properties.

起初这听起来可能没什么大不了的，但烯并不具备这种自由度，而这一简单事实对它们的性质产生了巨大影响。

Alkenes can be made into alkanes and alkynes can become either alkenes or alkanes depending on how many atoms are added.

烯可以转化为烷，而则可以根据添加的原子数量变成烯或烷。

If you paid attention, you learned that hydrocarbons with double bonds are called alkenes and those with triple bonds are called alkynes and that the naming rules are the same as for alkanes.

如果你注意听了，你应该知道带有双键的碳氢化合物称为烯， 带有三键的称为， 而且它们的名规则与烷相同。

Then, a little chemistry knocked the acid off, creating what was clearly an alkene, so they named it benzene, because it was an alkene that was from the benzoin resin.

然后，用一点化学方法将酸分解， 产生明显是烯的物质， 因此们将名为苯，因为它是一种来自安息香树脂的烯。

Well we know that they're unsaturated alkenes because saturated fats don't have double bonds, and thus, can't have cis- and trans- isomers.

我们知道它们是不饱烯， 因为饱脂肪没有双键，因此不会有顺式反式异构体。

So three words representing three different groups of organic compounds: alkanes for all single bonds, alkenes if they contain double bonds, and alkynes if they contain one or more triple bonds.

所以三个词代表三种不同的有机化合物组：烷表示全单键，烯表示含有双键，表示含有一个或多个三键。