The development of computational complexity theory has shown us that not all problems are created equal.
我记得,他总是反抗。他反抗是因为他知道如果他不反抗,下次就更不会反抗了。
States are rational actors that seek to maximize their power and security in an anarchic international system.
许多当代作家喝的东西比写的还要多。
The historian's first duty is to tell the truth as he sees it, regardless of whom it pleases or displeases.