數(shù)學(xué)不知道種族或地理界限；對(duì)于數(shù)學(xué)來(lái)說(shuō)，文化世界是一個(gè)國(guó)家。
The mining industry has the power to transform communities, but only if we do it responsibly.
真相并不美麗，但它是必要的。
The best way to learn something is to teach it.