So focus is what defines the difference between average performance and super performance.
因此，专注是区分普通表现和卓越表现的关键。
2020年高考英语阅读真题
After years of observing human nature, I have decided that two qualities make the difference between men of great achievement and men of average performance curiosity and discontent.
经过多年对人性的观察， 我断定有两种品质可以区分取得巨大成就的人与表现平平的人的好奇心和不满情绪。
英语百科
Best, worst and average case
（重定向自Average performance）
In computer science, best, worst, and average cases of a given algorithm express what the resource usage is at least, at most and on average, respectively. Usually the resource being considered is running time, i.e. time complexity, but it could also be memory or other resources.