The concept of reducibility is central to understanding the relationships between different computational problems.

We've been through a lot together, and that's what makes us stronger.

The secret of a good old age is simply an honorable pact with solitude.

The smallest atom of truth represents some man's bitter toil and agony.

我们必须建立一个既能保护公民又不与世界隔绝的欧洲。