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二西格玛
1、two two───22
2、two to two───二比二
3、erythrosin b sigma───红霉素b西格玛
4、lepidine sigma───雷帕迪西格玛
5、chloroplatinic acid sigma───氯铂酸西格玛
6、sigma ambient───西格玛环境
7、cinchonidine sigma───辛可宁西格玛
8、sigma amtraln───西格玛美国铁路公司
9、in two two───两个两个
1、First of all, this is the two s orbitals in hydrogen, 1s plus 1s smearing to give us this sigma molecular orbital.───首先，这是氢气中的两个s轨道，1s与1s轨道重叠，产生sigma分子轨道。
2、So this is the 1 s star, sigma 1 s star orbital, and what you have in the center here is a node, right in the center between the two nuclei.───这是1s星，sigma1s星轨道，中间这个是节点，它在两个原子核中间。
3、Any time two orbitals come straight on together in that internuclear axis, you're going to have a sigma bond.───任何时候两个轨道，在核间轴上直接到一起，你就能得到sigma键。