论文部分内容阅读
有人说就好像在战场上,子弹与子弹相撞的几率。更形象地说,就好像在一个一平方公里的空间里找到一个很小的物体,比如纽扣
Some say it’s like the chances of a bullet colliding with a bullet on the battlefield. More vividly, it’s like finding a small object in a space of one square kilometer, such as a button