"Now,with large epidemiological studies done everywhere including here, we can say with a great level of confidence that the disease affects roughly the same percentage of the general public worldwide.

VOA: special.2010.11.16

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

And then you'll find that your level of competency increases, your confidence level improves,

到时候你会发现你的能力提高了，信心增强了，

学第二外语的时候 - SpeakingMax英语口语达人