The document also says "Iran continues to pose a significant challenge to Iraq's long-term stability and political independence.

VOA: standard.2009.03.31

Octet stability is the term applied to this feature.

八电子稳定结构反映的就是这个特性。

麻省理工公开课 - 固态化学导论课程节选

Jobs.Jobs.Jobs. That is the key to the economic and security, long-term stability of this country,"

VOA: standard.2009.09.13