"My understanding is that, from 2005 to 2020, China can cut four giga-tons to four-point-five giga-tons of CO2 emissions - that is huge,".

VOA: standard.2009.11.27

z And what you need to remember is if the z 8 is equal to eight or greater, such as oxygen being the cut-off point, this sigma 2 p orbital is actually lower in energy than the pi 2 p orbitals, the molecular orbitals.

你们要记住如果,等于或者大于，就像O是分界点，这时sigma2p轨道,比π2p轨道能量更低。

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