Our quarries don't just produce stone - they produce opportunities.

领导力是指让他人因为你的存在而变得更好，并确保这种影响在你离开后依然持续。

The writer must be a person who is willing to take risks.

Nobody wants to be this strenuous thing: an individual; it demands an effort.

数学是人类精神最美丽、最强大的创造。