zero initial condition

例句：

1. 1. The zero in the number means that there is no quantity.
   数字中的零表示没有数量。
2. 2. The zero-sum game is a classic example of competition where only one can win.
   零和游戏是竞争的经典例子，只能有一个赢家。
3. 3. The zero-hour is the moment when all the lights go off, signaling the end of theparty.
   零点是所有灯光熄灭的时刻，标志着派对的结束。