此外，它关于键轴是圆柱对称的，这就是为什么我们知道它是sigma轨道。

Also, it is cylindrically symmetric around the bonding axis, so this is how we know that it's a sigma orbital.

youdao

键是，So, we, talk, about, a, sigma, bond，关于键轴圆柱对称的，需要着重指出的是，而且沿着键轴是没有节面的。

Sigma as being cylindrically symmetric about the bond axis, and it's important to point out that it has no nodal plane across this bond axis.

youdao

告诉我们关于，And，the，sigma，tells，us，something，about，the,分子轨道对称性的信息，特别是它关于键轴是圆柱对称的。

Sigma symmetry of this molecular orbital, specifically that it's cylindrically symmetric about the bond axis.

youdao

Also, it is cylindrically symmetric around the bonding axis, so this is how we know that it's a sigma orbital.

此外，它关于键轴是圆柱对称的，这就是为什么我们知道它是sigma轨道。

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