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.

这个分子本身二萜，一种有很多双键的碳氢分子。

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

相反，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.

每个双链意味着少两个氢原子。

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

例如，玉米油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.

每个碳原子之间都有双键连接，这样氢很难嵌入碳原子之间。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.

单链可以轻易地动，但双链将结构固定于特定的位置。

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将链固定成一个结。

So we have a polarized double bond situation here.

所以我们这里有一个两极分化的双键情况。

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

而且双链可以将链固定成一个结或直线。

Remember there are two types of bonds in double bonds.

请记住， 双键中有两种类型的键。

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

所以我们在碳和氧之间的双键中有四个电子。

It's not a double bond, it's a one-and-a-half bond.

这不双键， 而一个半键。

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

它包含3个双键， 因此每个碳共有4个键。

Acetone, with that big hunk and double bond is nice and polar, so it's water soluble; great for cleaning stuff.

丙酮，带有大块和双键， 很好的极性，所以它水溶性的； 非常适合清洁东西。

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。

Those double bonds could just as easily be in these positions and they are in those positions -- sort of.

那些双键可以很容易地处于这些位置并且它们处于那些位置 - 有点。

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？

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，而那些有三键的炔烃。

The point is that double or triple bonds can be usually opened up fairly easily.

关键双键或三键通常可以很容易地打开。