1. (通常指因位置改变而)消失,不见
    If you say that someone or something disappears, you mean that you can no longer see them, usually because you or they have changed position.

    e.g. The black car drove away from them and disappeared...
           那辆黑色轿车驶离了他们的视线。
    e.g. Clive disappeared into a room by himself...
           克莱夫独自一人进了屋。

2. 消失;失踪
    If someone or something disappears, they go away or are taken away somewhere where nobody can find them.

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    e.g. ...a Japanese woman who disappeared thirteen years ago...
           一个 13 年前失踪的日本女人
    e.g. Janet's husband and sister noticed that small kitchen objects were disappearing with increasing regularity.
           珍妮特的丈夫和她的姐姐发现厨房里的小物件经常不翼而飞，而且次数愈发频繁。

3. 不复存在;灭绝;消亡
    If something disappears, it stops existing or happening.

    e.g. The immediate security threat has disappeared.
           直接的安全威胁已不复存在了。