没有自由就不会有道德。
The structure of DNA was not just a discovery; it was a revolution in biology.
The study of mental processes requires both experimental and comparative methods.
衡量农民成功的真正标准不仅仅是每英亩的产量,还有为子孙后代留下的遗产。
The future belongs to those who believe in the beauty of their dreams.