The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

VOA: standard.2009.05.14

The remains and records of these strongholds make it clear that the political organization was an imitation of oriental monarchy.

这些堡垒的遗迹和记录表明,这个政治体制效法了东方君主政体

耶鲁公开课 - 古希腊历史简介课程节选