1
a chance event
用作可数名词，常与不定冠词连用。
A chance event changed our lives.
一次偶发事件改变了我们的生活。
偶然事件；巧合事件
先理解核心含义，再看它在真实句子里的用法。
偶然事件；巧合事件
something that happens suddenly or by chance, without any apparent cause
A chance event changed our lives.
一次偶发事件改变了我们的生活。
无明确原因而突然或偶然发生的事情
anything that happens suddenly or by chance without an apparent cause
Winning the lottery was a pure chance event.
中彩票纯粹是一个偶发事件。
The meeting of those two old friends was a chance event that changed their lives.
那两位老朋友的相遇是一个改变了他们人生的机遇事件。
In science, a chance event can lead to a major discovery.
在科学中，一个偶发事件可能导致重大发现。
用作可数名词，常与不定冠词连用。
A chance event changed our lives.
一次偶发事件改变了我们的生活。
常与rarely, seldom等副词搭配。
Such a chance event rarely occurs.
这种偶发事件很少发生。
用于表示原因或方式。
The discovery was made by a chance event.
这个发现是由一次偶发事件促成的。
动词后接宾语和as补足语。
They regarded the meeting as a chance event.
他们认为这次相遇是一次偶发事件。
Not this
Chance event is unpredictable.
Use this
A chance event is unpredictable.
错误：缺少冠词。'chance event' 是可数名词短语，需加不定冠词 'a' 表示泛指。
Not this
We met by chance event.
Use this
We met by chance.
错误：介词搭配错误。'by chance' 是固定短语，表示偶然发生，无需添加 'event'。'chance event' 是名词短语，不能用于此结构。
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Dictionary facts from ECDICT.