在量子力学中,轨迹的概念失去了意义。
Sometimes the simplest questions lead to the deepest theories.
Program testing can be used to show the presence of bugs, but never to show their absence!
Science is a force for good, but only if we use it wisely.
"La verdadera patria del escritor es su lengua."
"The world is a book, and those who do not travel read only one page."