Quantum cryptography doesn't rely on the difficulty of mathematical problems, but on the fundamental laws of physics.
在合适的人手中,一本书可能比刀更危险。
死亡是少数几件只要躺下就能完成的事情之一。
The greatest threat to our forests isn't logging—it's indifference.
"A writer's duty is to tell the truth, even when it is uncomfortable or inconvenient."