These are of two varieties, known as single and double bonds.

化学键有两种，单键和双键。

The molecule itself is a diterpene, a kind of carbon-and-hydrogen molecule with lots of double bonds.

这分子本身是二萜，是一种有很多双键的氢分子。

Unsaturated fats, on the other hand, contain double bonds that create an irregular kink in their structure.

，非饱和以双键以双键不规则地连接在一起。

Each double bond means two fewer hydrogens.

每双链意味着少两氢子。

And that double bond can either lock the chain into a kink or lock it straight.

而且双链可以将链定成一结或是直线。

Corn oil, for example, is made up of lipids with lots of double bonds, also known as polyunsaturated fats.

例如，玉米油是由许多双键的脂类组成的，这类物质也叫作多元不饱和脂肪。

The carbons double bond with each other so that fewer hydrogen can fit and we call this unsaturated fat.

每子之间都有双键连接，这样氢很难嵌入子之间。我们称这种脂肪为不饱和脂肪。

Single bonds can rotate around their axis no problem, but double bonds lock a structure into place.

单链可以轻易地绕轴转动，但双链将结构定于特定的位置。

In nature, a double bond in a fat chain almost always locks it into a kink.

事实上，脂肪链中的双链几乎都是将链定成一结。

When that rampaging ion destroys the double bond, the stain disappears.

当狂暴的离子破坏双键时， 污渍就会消失。

So we have a polarized double bond situation here.

所以我们这里有一两极分化的双键情况。

You recognize the -alkane ending there, so there must be no double bonds, right?

你认出了 -alkane 在那里结束， 所以一定没有双键， 对吧？

And so we have four electrons in this double bond between the carbon and the oxygen.

所以我们在和氧之间的双键中有四电子。

This ring has five carbon atoms and a double bond, so it's a cyclopentene.

例子：这环有五子和一双键， 所以它是一环戊烯。

So the logic goes something like, well, you have these multiple double bonds and so they can be oxidized.

因此，逻辑是这样的，嗯，你有这些多双键， 所以它们可以被氧化。

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

如果它们有双键，我们称它们为烯烃，而那些有三键的是炔烃。

Those rings and double bonds don't give PET much flexibility, so the polymers tend to pack closely together, and are harder to melt.

那些环和双键无法给 PET 太多的灵活性，所以聚合物会被紧密地聚合在一起，更难被熔化。

It's especially good at tearing up the tricky double bonds that tend to give laundry stains their color.

它特别擅长撕裂容易使衣物污渍变色的棘手双键。

It contains 3 double bonds, so that each carbon has a total of 4 bonds.

它包含3双键， 因此每共有4键。

Remember there are two types of bonds in double bonds.

请记住， 双键中有两种类型的键。