The best time to plant a tree was 20 years ago; the second-best time is now.
The concept of NP-completeness has provided a powerful tool for understanding the complexity of computational problems.
I don't care what others say, only what I do.
世界确实充满了危险,其中有许多黑暗的地方;但仍然有许多美好的事物,尽管在所有土地上,爱现在与悲伤交织在一起,但它或许因此变得更加伟大。
"The world is full of stories, but only a few are worth telling."