The father is an efficiency expert, an expert in doing things better and faster.

VOA: special.2009.05.04

There are different activities you can do where if you're good enough at them, if you're expert enough at them, you don't know you're doing them.

有很多不同的事情,如果你很擅长这些活动，你对这些活动非常在行，那么你是不会意识到你正在做这些事情的。

耶鲁公开课 - 心理学导论课程节选

You know, you become expert on what you are doing. You learn more things.

如果你想成为你领域里的专家，那么你必须学习更多的东西。

研究生院也在这里 - SpeakingMax英语口语达人

in the minds of military expert, they probably been doing more good than harm.

但对于军事专家来说，这个可能就是好处多余坏处了。

普林斯顿公开课 - 国际座谈会课程节选