One man,who did not give his name, has been single for a long time.

VOA: standard.2010.02.13

And resonance is the idea that sometimes one single Lewis structure does not adequately describe the electron configuration around a given molecule, so instead you need to draw two different Lewis structures to describe that more appropriately.

而所谓共振态,就是有时候一个路易斯结构不足以,完整描述一个给定分子的电子排布，因此这时你需要同时画出两个,不同的路易斯结构来描述它,这样会更恰当。

麻省理工公开课 - 化学原理课程节选

As Hanson says, thus arose the kleros, or the idea of a privately held plot attached not to any one person, but rather in perpetuity to a single farm family or oikos.

如汉森所言,kleros兴起了,或是说有了私有土地,而不再属于单个人的观念产生了,也可永久的属于单个的农业家庭或者领主

耶鲁公开课 - 古希腊历史简介课程节选

Your committee is concerned that in not one single case of a trial that has taken place to date, have they actually been charged with a terrorist act.

VOA: standard.2009.04.09