knock-out zone

例句：

1. 1. The boxer's punch was so powerful that it knocked out the opponent.
   拳击手的一记重拳非常有力，将对手击倒。
2. 2.The car accident knocked out all the occupants of the bus.
   车祸导致公交车上的所有乘客都昏迷不醒。
3. 3.The scientist discovered a new way to knock out cancer cells.
   科学家发现了一种新的方法来击倒癌细胞。