1. existence n. 存在，实在; 生活
例句：The essence of policy is the existence of discretion.
政策的重点是进行慎重判断。

2. conscious adj.有意识的，神志清醒的; 自觉的
例句：Although dying, he was quite conscious.
他虽在弥留之际，但十分清醒。

3. opponent n.对手; 敌手; 反对者
例句：He downed his opponent in the first round.
他在第一个回合中击倒对手。

4. isolate vt.使隔离，使孤立
例句：The white people are unable to isolate the black.
白人不能孤立黑人。

5. defeat vt.挫败; 击败
例句：It was gradually borne in on us that defeat was inevitable.
我们渐渐地认识到失败是不可避免的。
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