The 2 sigma comes from two standard deviation, sigma, the symbol for standard deviation.

2 sigma 来自两均方差，sigma 是均方差的符号。

So this is the capital Greek letter sigma right over here, it's shorthand math, math shorthand for sum.

这是大写的希腊字母，它是数学中总和的简写。

This could apply to females as well, of course, called the 'sigma female'.

这也适用于女性，当然，被称“西玛女性”。

When I started this channel I made a highly criticized video about an idea called the sigma male.

当我开始这频道时，我制作了一备受批评的视频，讲述了一叫做西玛男性的想法。

Four sigma is like one in 10,000 chance that it's just noise that created this correlation across the pulsars.

“4 西玛”指的是“噪声是造成脉间相关性的原因”的几率万分一。

And that's the same thing as sigma squared of y.

这与 y 的平方西玛是一样的。

And a long string of sequential terms added together is collapsed into a capital sigma.

一长串连续的项加在一起被折叠成一大写的西玛。

But the sigma right here, that is just the standard deviation of the distribution.

但是这里的 sigma 只是分布的标准偏差。

This straightforward sort of bond is called a sigma bond.

这种简单的债券称 sigma 债券。

As they come together for the bond, the sigma bonds will occur between the hybridized orbitals.

当它们聚在一起形成键时， σ键将出现在杂化轨道间。

Double bonds consist of a sigma bond and a pi bond.

双键由西玛键和π键组成。

The sp orbital, the one that forms the sigma bonds here, is linear.

在这里形成西玛键的 sp 轨道是线性的。

That pi bond bridges the sigma bond, locking it in place.

那 pi 键桥接 sigma 键，将它锁定到位。

According to this idea, the sigma male does not identify with a specific place in the hierarchy, or with a group for that matter.

根据这想法，西玛男性不认同等级制度中的特定位置，或者就此而言，不认同一群体。

The variance of a population-- and it's this Greek letter, sigma.

总体方差——就是这希腊字母 sigma。

And now we're just going to do some algebra, some sigma algebra I guess you could call it.

现在我们要做一些代数，一些 sigma 代数，我想你可以称。

Single bonds, also called sigma bonds, are pretty simple, and carbon atoms attached by them can rotate around the bond freely.

单键，也称西玛键，非常简单，它们所附着的碳原子可以围绕键自由旋转。

We've been dealing with these sigma notation variables and all that so far.

到目前止，我们一直在处理这些 sigma 符号变量等等。

The triple bonds in alkynes, meanwhile, are composed of 1 sigma bond and 2 pi bonds for a total of 3 bonds.

同时，炔烃中的三键由 1 sigma 键和 2 pi 键组成，总共 3 键。

And in a population, the variable, or the notation for variance, is the sigma squared.

在总体中，变量或方差符号是西玛平方。