No great discovery was ever made without a bold guess.
没有大胆的猜测,就没有伟大的发现。
追求数学真理是一项崇高的努力。
The beauty of architecture emerges from solving problems, not from decorating surfaces.
Faith has to do with things that are not seen, and hope with things that are not at hand.
如果没有地幔对流的概念,大陆漂移理论将只是一种猜测。