Polio is no longer a concern in Western countries because of mass inoculations starting in the 1950s.

VOA: standard.2010.08.02

And it increases the role of these economic elites or their concern with maintaining their privileges against threats to their privileges and to their prosperity no matter where they come from.

这在提高了经济精英的地位的同时,也使他们更担心如何保持他们的特权,以及如何对抗对他们特权和繁荣的威胁,无论威胁来自何方

耶鲁公开课 - 欧洲文明课程节选

There was no separate caste of priests and there was very little concern, I don't mean any concern, but very little concern with life after death which was universally important in other civilizations.

没有独立的教会阶层,城邦里的人们很少关注来生这个概念,很少关注,不是说完全没有关注,此观念在当时的其他文明中是极为重要的

耶鲁公开课 - 古希腊历史简介课程节选