event
[名词]
anything that takes place, particularly something important

事件, 活动
Ex: Graduation day is a event in the lives of students and their families .
phenomenon
[名词]
a fact, event, or situation that is observed, especially one that is unusual or not fully understood

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

事故, 意外
Ex: Despite taking precautionsaccidents can still happen in the workplace .
disaster
[名词]
a sudden and unfortunate event that causes a great amount of death and destruction

灾难, 灾祸
Ex: The outbreak of the disease was a public disaster.
coincidence
[名词]
a situation in which two things happen simultaneously by chance that is considered unusual

巧合, 偶然
accidentally
[副词]
by chance and without planning in advance

意外地, 不小心地
Ex: accidentally left the door unlocked all night .
turning point
[名词]
a point at which a drastic change occurs in a situation, especially one that makes it improve

转折点, 关键点

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