phenomenon
a fact, event, or situation that is observed, especially one that is unusual or not fully understood

现象, 事件

[名词]
accident
an unexpected and unpleasant event that happens by chance, usually causing damage or injury

事故, 意外

[名词]
disaster
a sudden and unfortunate event that causes a great amount of death and destruction

灾难, 灾祸

[名词]
coincidence
a situation in which two things happen simultaneously by chance that is considered unusual

巧合, 偶然

[名词]

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