最近的变革加剧了航空公司之间的竞争。

Recent changes have ___sharpened competition between the airlines.

我希望这门课程能帮助我提升我的计算机技能。

I hope this course will help me ___sharpen my computer skills.

事实上，老师和教授给了我们拓宽知识、磨练批判性思维以及总体上培养心智和灵魂的机会。

In fact, teachers and professors give us the opportunity to broaden our knowledge, ___sharpen our critical thought and in general to cultivate our mind and soul.