The beauty of mathematics lies in its ability to simplify complex problems.
La historia no es solo lo que sucedió, sino lo que pudo haber sucedido.
The world is everything that is the case.
If you can't mine it safely, you shouldn't mine it at all.
好比有一百扇门而只关上一扇,那么盗贼怎么就会没有地方进去呢