Smith-Valade told VOA one of the key communications objectives for the Vancouver Olympics was to present Canada's linguistic duality of English and French, which are also the two languages of the IOC.

VOA: standard.2010.02.25

There's a duality of people.

人类具有二元性

耶鲁公开课 - 心理学导论课程节选

So this validates de Broglie and it also validates the whole concept of wave-particle duality.

这就证实了德布罗意的观点,也证实了,波粒二象性的原理。

麻省理工公开课 - 固态化学导论课程节选