You are never too old to chase your dreams.

一个奇怪的事实是，关于地球史前条件得出了完全相反的结论，这反映了我们目前知识的不完整状态。

The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.

幸福不是现成的东西。它来自于你自己的行动。