A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.

It is not unlikely, but that there may be yet invented several other helps for the eye, as much exceeding those already found, as those do the bare eye.

The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.

企业的核心竞争力在于其独特的资源和能力。

读者的诞生必须以作者的死亡为代价。