Phase four means that a virus has gained the ability to cause community-level outbreaks.

VOA: special.2009.05.06

Because you'll have an appropriate level of confidence and competence in your ability to do computational problem solving.

因为你们在自己的能力范围内,拥有应对解决计算问题的,正当水平的自信心和竞争力。

麻省理工公开课 - 计算机科学及编程导论课程节选

Their reading ability is at level one or two.

都存在文化素养问题，他们的读写能力很低。

麻省理工公开课 - 媒体、教育、市场课程节选

"I define success as the ability to empower and transfer responsibility to Afghans as rapidly as possible, and achieve a sufficient level of stability to ensure that we can leave behind an Afghanistan that is not controlled by al-Qaida or the Taliban,".

VOA: standard.2009.10.26