Now,doctors have the first treatment guidelines from the American Academy of Otolaryngology Head and Neck Surgery Foundation.

VOA: special.2009.09.02

For example, that embryo that I showed on one of the first slides where there's clearly a head region and a tail region.

比如我在第一张幻灯片里展示的那种胚胎,已经有了明显的头部和尾部

耶鲁公开课 - 生物医学工程探索课程节选

He is the first head of state to be charged by the I.C.C.

VOA: special.2010.06.21

It was the first visit to Iraq ." by a Turkish head of state in 33 years.

VOA: standard.2009.03.23