The Pythagorean theorem is still true even though Pythagoras is dead, I assure you it's true.  Even if the world collapsed the Pythagorean theorem would still be true.
虽然毕达哥拉斯已经死了， 但勾股定律依然是正确的， 我可以向你保证。 即便世界消亡了， 勾股定律还是正确的。