你唯一的限制就是你相信的限制。
The beauty of Shor's algorithm is that it shows how a quantum computer can solve a problem that is believed to be intractable for classical computers.
比如说,你下午四点钟来。那么从三点钟起,我就开始感到幸福。时间越临近,我就越感到幸福。到了四点钟的时候,我就会坐立不安:我就会发现幸福的代价。