In quantum mechanics, we have to abandon the idea that particles have definite properties before measurement.
The truth is often found in contradiction.
唱歌是我对音乐这份天赋表达感激的方式。
全球金融危机是现代历史上最严重的危机,需要采取非同寻常的应对措施。
一个问题如果在计算机上可以快速解决,那么它属于P类问题;如果一个解可以快速验证,那么它属于NP类问题。