The concept of NP-completeness has provided a powerful tool for understanding the complexity of computational problems.

We must balance the need for energy today with the imperative of protecting the planet for tomorrow.

A good film is one that leaves you thinking long after it's over.

将过去交托给上帝的怜悯，将现在交托给上帝的爱，将未来交托给上帝的谋划。