安全困境是国际政治的一个基本特征，因为国家增加自身安全的努力往往会降低其他国家的安全。

Success is a function of persistence and doggedness and the willingness to work hard for twenty-two minutes to make sense of something that most people would give up on after thirty seconds.

暗示某些历史真相或古墓之谜不应被揭开。