零

例句：

1. 1. The total number of students in the class is zero.
   班级里的学生总数是零。
2. 2. There are no more cars on the road.
   路上没有更多的车了。
3. 3. The zero-sum game theory suggests that all gains must be balanced by equal losses.
   零和游戏理论表明，所有收益都必须通过相等的损失来平衡。