Economists say imparting quality education is critical for a country where one third of the billion-plus people are under 15 and where, despite a booming economy, many people are still poor.

VOA: standard.2010.04.01

Agricultural villages will have existed all over the place in the late Stone Age, in the Neolithic Period, as it is known. But there is a difference and the critical difference is that a city contains a number of people who do not provide for their own support.

农业村庄在石器时代后期,以及新石器时代随处可见,但二者是有区别的,最重要的区别在于,城市能容纳,相当数量,无需自给自足的人口

耶鲁公开课 - 古希腊历史简介课程节选

"The government has identified the critical problem we have at the moment is electricity for all the population.

VOA: standard.2009.08.28

He said the first 72 hours are critical in saving survivors, and he is still holding out hope for both Haitians and U.N.

VOA: standard.2010.01.14

This is expected very soon in Cairo." The coming 72 hours,argues Saif, is a very critical period, as both parties jockey for position and fighting intensifies.

VOA: standard.2009.10.11

He says it is critical to address the immediate needs of the Tamil people, to work for reintegration and reconstruction of the society and to achieve a sustainable and equitable political solution.

VOA: standard.2009.05.19