政策辩论应以严格的实证分析为基础。
Politics is almost as exciting as war, and quite as dangerous. In war you can only be killed once, but in politics many times.
The study of ancient DNA is like opening a window to the past.
一个好的科学家就像侦探，总是在细节中寻找线索。
成功不仅仅在于你取得了什么成就，还在于你如何取得这些成就。
The universe is a vast and mysterious place, and we are only beginning to understand its complexities.
Your group can achieve great things way beyond your means simply by showing people that they are appreciated.
The sea is a place of great beauty and great terror.